1. To establish the identity of someone or something.
  2. To establish the taxonomic classification of an organism.
  3. To equate two or more things.
  4. To have a strong affinity ; to feel oneself to be modelled on or connected to.
  5. To associate oneself with some group.
  6. To claim an identity; to describe oneself as a member of a group; to assert the use of a particular term to describe oneself.
  7. To map a number of points to one.
  8. To make to be the same; to unite or combine into one.

The above text is a snippet from Wiktionary: identify
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