noun

• (strictly) The act of identifying (i.e., which one, which thing).
• (broadly, often) The combination of identifying (which one, which thing) and validating the identity (proving or confirming it); identifying and authenticating viewed as a unitary concept in cognition.
• The state of being identified.
• (countable) A particular instance of identifying something.
• A document or documents serving as evidence of a person's identity.
• A feeling of support, sympathy, understanding, or belonging towards somebody or something.