Meaning

1. To match (something or someone which one currently perceives) to a memory of some previous encounter with the same person or thing.
2. To acknowledge the existence or legality of; to treat as valid or worthy of consideration.
3. To acknowledge or consider (as being a certain thing or having a certain quality or property).
4. To realize or discover the nature of something; apprehend quality in.
5. To show formal appreciation of, as with an award, commendation etc.
6. (obsolete) To review; to examine again.
7. (obsolete) To reconnoiter.
8. To have the property to bind to specific antigens.