1. arrange or order by classes or categories

- How would you classify these pottery shards--are they prehistoric?

Similar word(s): assort, class, separate, sort

Definition categories: cognition, categorise, categorize

2. declare unavailable, as for security reasons

- Classify these documents

Definition categories: social, control, restrict

3. assign to a class or kind

- How should algae be classified?

Similar word(s): relegate

Definition categories: cognition, assign, attribute

Sentences with classify as a verb:

- Should we classify "make up" as an idiom or as a phrasal verb?

- They decided to classify that information.