(UK, dialect, obsolete) Some others.

(informal) A man who is romantically involved with someone (usually a woman) already in a committed relationship with another man, especially a man having an affair with a married woman.

Of or pertaining to attraction to the opposite sex; heterosexual.

(military, chiefly in the plural) A soldier who is not a commissioned officer.

plural of other rank

(rare) Of or relating to sexual orientation toward a different sex from one's own; heterosexual; allosexual.

(euphemistic) Synonym of anus / (with "the") The other party in a telephone call.

(US, politics) Either the Senate or the House of Representatives, from the point of view of the other.

(idiomatic) Very special.

(idiomatic) In a very special way.