Secondary-definition mechanism
SAT glossary · Reading & Writing
Definition
The design behind the hardest vocabulary items: they use easy words in their second or third senses (qualify as "limit a claim," sanction as "authorize," sound as "valid"). Testing perspicacious would measure your reading history; testing qualify measures whether you can suppress the dominant sense and retrieve the subordinate one — a reasoning skill that discriminates beautifully at the top of the scale.
Secondary-definition mechanism in plain English
Some of the hardest vocabulary questions aren't testing rare, obscure words you've never seen — they're testing common, everyday words used in their LESS-familiar, secondary or third meaning. For example: 'qualify' can mean 'to limit or add a condition to a claim' (not just 'to become eligible'), 'sanction' can mean 'to officially authorize' (not just 'to punish'), and 'sound' can mean 'valid or well-reasoned' (not just 'a noise'). Testing a genuinely rare word like 'perspicacious' would really just be measuring how much random vocabulary you've happened to encounter in your reading — but testing a common word like 'qualify' in its secondary sense measures something much more valuable: whether you can suppress the FIRST meaning that jumps to mind and correctly retrieve the LESS obvious one that actually fits the sentence.
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