A surname.

In a civilian aircraft: a transponder that responds by sending a code identifying itself.

Joins two alternatives to mean either or both; indicates that inclusive or is meant where or alone might be taken to mean exclusive or.

(heraldry) The gold or yellow tincture on a coat of arms.

Connects at least two alternative words, phrases, clauses, sentences, etc. each of which could make a passage true. In English, this is the "inclusive or." The "exclusive or" is formed by "either[…]or".

(logic, electronics) Alternative form of OR

(obsolete) Early (on). / (obsolete) Earlier, previously.

(now archaic or dialect) Before; ere. Followed by "ever" or "ere".

Oregon, a state of the United States of America. / Orissa, a state of India.

(logic, computing) Exclusive disjunction: the use of or to indicate that of two predicates, one is true and one is false (without specifying which is which); contrasted with inclusive or, which does not imply that one must be false.