ACT® · Reading — Craft and Structure: Word Meanings and Word Choice
Technical and Domain-Specific Words
A technical word's meaning sits inside the sentence that first uses it, usually unlabeled as a definition. You find it by reading the surrounding numbers, causes, and comparisons, not by knowing the field already.
A science or social-science passage often drops a specialist term without ever writing the word "means" or "is defined as." Instead it surrounds the term with the details that pin it down: a rate, a depth, a comparison, a consequence. The sentence is doing the work of a dictionary while looking like it is just reporting facts. Your job is to notice that the information around the word is the definition, assembled instead of announced.
This matters most for two cases. First, a hard term that looks unfamiliar but gets built for you on the spot, like a word for one plate sliding under another, explained through its rate and depth rather than a formal gloss. Second, and trickier, an everyday word borrowed by a field and narrowed. "Stable" in daily life means unchanging. In chemistry, the passage redefines it as sitting lower in energy than the alternatives, and even gives a case, diamond, that stays put while technically being unstable by that definition. If you keep the everyday sense, you get the question backwards.
This connects to the rest of word-meaning work on the dial: context fixes one meaning out of several possible ones, whether the word is ordinary or technical. The only difference here is that the surrounding clues are numbers and causal chains instead of plot or feeling. That is also why outside knowledge of the field is never required and can actively mislead you if it conflicts with how the passage itself is using the word.
Key terms
- Technical term
- A word with a precise, narrow meaning inside one field, often built from everyday vocabulary.
- Embedded definition
- A definition given through surrounding details and consequences rather than a labeled statement.
- Domain-specific meaning
- A sense a word takes on only within a particular subject, distinct from its everyday sense.
- Context clues
- The numbers, causes, or comparisons near a word that let you infer its meaning without outside knowledge.
Watch it explained
- How it worksHow does a text teach you a specialist term in the same sentence it first uses it?
- Worked exampleShow me pulling the meaning of subduction out of a sentence that never defines it.
- Going furtherWhat changes when a discipline uses an everyday word with a narrow specialist meaning?
- Common mistakeWhy isn't outside knowledge of a technical term ever required to answer correctly?
Check yourself
End of topic.