Building Your IB Glossary｜A Cross-Subject Vocabulary System for Exam Success
Struggling to write precise definitions under exam pressure? Move beyond subject-by-subject vocab lists and build a cross-subject glossary system that turns terminology into a reusable knowledge network.
Why Does a Personal IB Glossary Matter More Than a Textbook Index?
Building a personal glossary is one of the highest-leverage study habits available to an IB student—not because it adds more content to memorise, but because it forces you to process vocabulary actively rather than passively. A textbook index tells you where a word appears; a personal glossary tells you what that word means to you, how you have used it, and where it connects to other ideas across your subjects.
The payoff is cross-component efficiency. When you define "equilibrium" for Chemistry HL, that same entry, with a tag added, becomes useful for Economics HL and for a TOK question about scientific models. You do the intellectual work once and redeploy it many times.
What Makes a Glossary Entry Actually Useful on Exam Day?
Most students write definitions and stop there. The problem is that IB exams rarely ask "define X" in isolation—they ask you to apply X, evaluate X, or compare X with Y. An entry that serves you on exam day needs more than a copied definition.
The Four-Field Formula
| Field | What to Write | Example (Economics HL) |
|---|---|---|
| Definition | Your own words, concise | "A market structure with one dominant seller, restricting competition" |
| Usage example | Sentence from a past paper or your IA | "The monopoly maximises profit where MC = MR, resulting in allocative inefficiency." |
| Subject tag | Short label(s) | #EconHL #TOK |
| Related terms | 3–5 linked words | oligopoly, price-making, deadweight loss, market power |
The "usage example" field is the one students most often skip—and the one that matters most. Seeing a term in context is what trains your brain to deploy it under pressure. Pull examples from past paper markschemes, from your teacher's feedback on essays, or from your own Internal Assessment(IA) drafts.
For a deeper look at how this plays out in a specific subject, see the IB Economics HL complete guide, which walks through how command-term vocabulary shapes 15-mark responses.
How Do You Build a Cross-Subject Tagging System That Doesn't Collapse?
The temptation when building a cross-subject system is to over-engineer it—too many categories, nested sub-tags, elaborate colour codes. The system then becomes the project, and actual studying stops. Keep the tagging layer simple and stable.
A Tag Structure That Scales
Subject tags (always present): #BioHL / #ChemHL / #EconHL / #PhysHL / #EngA / #Math / #TOK / #EE
Function tags (optional, add only when genuinely useful):
#command-term— IB command terms (analyse, evaluate, discuss, etc.)#cross-subject— appears in two or more subject syllabi#TOK-link— explicitly useful in a TOK essay argument#IA-vocab— technical term needed in your IA write-up#verify— you are not fully confident; check with teacher or subject guide
The #verify tag deserves special mention. Every time you write down a detail that feels subject-to-change—an assessment criterion label, a marking threshold, a submission format—tag it #verify and add a note: "Check current subject guide or ask teacher before using." This habit alone prevents the dangerous mistake of studying outdated information.
Which Tools Work Best—Digital, Paper, or Both?
Neither digital nor paper is strictly superior; the honest answer is that they do different things well. The most effective approach combines both.
| Digital (Notion, Anki, etc.) | Paper (Index Cards) | |
|---|---|---|
| Best for | Searching, tagging, linking entries, sharing with study partners | Active recall, spaced repetition without screens, portability |
| Weakness | Easy to become passive (copy-paste without thinking) | Harder to reorganise; no full-text search |
| IB use case | Building the master glossary database; TOK/EE cross-referencing | Daily 10-card review; pre-exam sessions |
A Practical Two-Layer Setup
Layer 1 — Digital master database. Use a tool with tagging and backlinks (Notion works well; a simple spreadsheet works too). Each row is one term. Columns match the four fields above, plus a tag column. The key discipline: every entry must be typed in your own words before you hit save. No copy-pasting from the textbook.
Layer 2 — Paper recall cards. Once a week, transfer new entries to index cards: term on the front, definition + one usage example on the back. These are your retrieval practice tools—cover the back, say the definition aloud, check.
If you prefer to go fully digital for the recall layer, Anki's spaced-repetition algorithm is effective. The risk is that the ease of importing decks other people made bypasses the active-processing step. Make your own cards.
How Should You Maintain the Glossary Week by Week Without Burning Out?
A glossary you build in September and never touch is almost useless by February. The system needs a lightweight, repeatable maintenance cycle. Here is one that works within a realistic IB schedule.
The Weekly Add-Test-Revise Cycle
Add (Monday–Friday, ~5 minutes per subject per day): As you finish each lesson or reading block, identify the 1–3 terms that appeared and that you could not define confidently before the class. Add them to the digital database immediately.
Test (Saturday, ~20 minutes): Pull out the paper cards for everything added that week. Self-test without looking at the back. Cards you get wrong go into a "struggle pile."
Revise (Sunday, ~10 minutes): Review the struggle pile only. Update the digital entry if your understanding has changed—add a better usage example, correct a misstatement, link to a related term you only now recognise.
This cycle scales. During a light week you might add five terms total. During a heavy content week—say, a new Biology unit or an Economics paper—you might add twenty. The Sunday revision session stays short because it only revisits what was genuinely difficult, not everything.
For broader strategies on keeping this kind of system running alongside IA deadlines and the Extended Essay, the IB Diploma time management guide is worth reading.
How Do You Use the Glossary for TOK and the Extended Essay?
This is where the cross-subject investment pays its biggest dividend. TOK essays and the Extended Essay(EE) both require you to think and write across conceptual boundaries—exactly what a well-tagged glossary trains you to do.
TOK: Turning Subject Terms Into Knowledge Claims
When you write a TOK essay, you need real subject-specific examples grounded in precise vocabulary. Your glossary entries tagged #TOK-link are a curated bank of exactly those examples.
For instance, if your glossary has an entry for falsifiability (#PhysHL #BioHL #TOK-link), you already have: a definition, a scientific usage example, and, if you wrote the entry well, a note about why this term is epistemologically interesting. That is a TOK paragraph almost assembled.
The move is simple: before you draft a TOK essay, search your digital glossary for #TOK-link. Read those entries. Notice which ones fit the essay prompt. Then build your examples outward from terms you actually understand rather than reaching for concepts you half-remember.
For a full breakdown of TOK essay structure, see the IB TOK complete guide.
EE: Maintaining Terminological Consistency
One underappreciated challenge in the Extended Essay is using technical terms consistently across 3,000–4,000 words (check the current limit in your subject guide and with your supervisor—do not rely on any figure you find online). Students often introduce a term one way in the introduction and use it slightly differently in the analysis, creating contradictions that cost marks.
Your EE glossary layer is the fix. Create a small sub-list—within your main glossary—of every technical term appearing in your EE, with the exact definition you are using in that essay. Review it before every writing session. When your supervisor gives feedback, update those definitions.
Tag each EE term with both the subject tag and #EE. If you change your definition during revision, note the old version and why you changed it. This documentation habit also helps during the viva voce or any supervisor discussion.
The IB Extended Essay guide covers research and argument structure in detail; a personal glossary is the vocabulary infrastructure that underlies all of it.
What Are the Most Common Glossary Mistakes IB Students Make?
Knowing what to avoid saves time early.
Copying definitions verbatim. A copied definition is a storage action, not a learning action. The test: close the source and rewrite the definition without looking. If you can't, you don't know it yet.
Building too late. Students who start their glossary in the revision period are doing emergency work. Starting in the first month of the course, even with rough entries, gives you a year of accumulated retrieval practice.
Ignoring command terms. IB command terms—analyse, evaluate, discuss, to what extent—are vocabulary too. They have specific meanings in IB marking contexts. Treat each one as a glossary entry with a definition and an example of how an examiner uses it. This is often the difference between a response that technically addresses the question and one that actually answers it the way the markscheme rewards.
Treating the glossary as complete. Entries should evolve. The definition you wrote in October will be shallower than what you understand in March. Revisiting and upgrading old entries is not wasted time—it is evidence that you are actually learning.
Recording assessment details as permanent facts. If you write "the IA is X words" or "Paper 2 has Y questions," you are recording something that may change with syllabus updates or differ between schools. Tag these details #verify and always confirm with your teacher and the official subject guide before acting on them.
A Quick-Start Template You Can Use Today
If you want to begin today, here is a minimal template you can paste into Notion, Google Docs, or a paper notebook:
Term:
Subject tag(s):
Definition (own words):
Usage example:
Related terms:
Function tag(s):
Date added:
Last revised:
Notes / verify:Start with the subject you have a class or assignment for this week. Add three to five terms. Test yourself tomorrow morning. That is the entire system at its core—the rest is refinement.
If you find that your glossary reveals consistent gaps in how you understand a subject's core concepts, or if cross-subject connections feel unclear despite the system, working through those gaps with an IB-experienced tutor can accelerate the process considerably. At Quick IB, our tutors have been through the Diploma themselves and can help you see where vocabulary misunderstandings are quietly costing you marks across components.