Final answer:
Recognizing the meaning of a partially known word in context is an example of receptive vocabulary, which includes words understood by individuals, in contrast to expressive vocabulary used actively in communication.
Step-by-step explanation:
Recognizing the meaning of a partially known word in context is an example of receptive vocabulary. Receptive vocabulary includes words that listeners or readers understand, even if they might not use them actively in conversation or writing. This is opposed to expressive vocabulary, which involves words that individuals can both understand and use.
Children develop both receptive and expressive vocabulary as they grow, and can often understand more words than they can actively use in speech. In practice, when a student deduces the meaning of a new word through context, they are utilizing and expanding their receptive vocabulary.