With future reference: to observe (what will happen); to discover, find out. Cf. sense 19a. transitive. With interrogative clause as object.

To recognize; to distinguish, discern, detect: = know, v. 1a 1b 5. Obsolete or rare archaic.

transitive. = descry, v.1 (in various senses); to observe; to denounce. Obsolete.

transitive. To discover or perceive (a person, thing, fact, etc.), esp. by careful observation; to detect, discern, observe. Also occasionally intrans…

To find out, to search or seek out, by observation or scrutiny.

intransitive. To have or gain insight into (esp. something mysterious or obscure, as the future, a person's soul, etc.); to attain knowledge or…

transitive with object clause. To perceive, discover.

To find out or ascertain by watching. Obsolete.

transitive. To disclose, discover; = descrive, v. 6.

transitive. Originally slang. To catch sight of (something); to mark or note; to recognize or detect. Now the most common sense.

To take in with the eye or the mind; also with these as subject.

figurative. To perceive as if by smell; to smell or smell out (a plot, etc.); to suspect. Also with out.