Knowledge of word forms, meanings and their uses. Number of recognised words and depth or flexibility of knowledge are different dimensions.
Learning about unfamiliar words during engagement with text without direct vocabulary instruction. Small encounter-level gains can be measurable, but long-term extrapolations depend on reading amount, prior knowledge and test sensitivity.[ref]
Richness and precision of knowledge about a word, including relations, context and multiple meanings.
The range of words known under a specified criterion. A recognition test and an expressive definition test need not identify the same boundary.

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