(obsolete outside England and Scotland dialects) He, or sometimes she, it.

(archaic or slang) Of.

(chiefly Scotland) All.

(chiefly Scotland) All.

Distance from leading edge to aerodynamic center. / specific absorption coefficient / specific rotation / allele (recessive) / (stenoscript) (a) an initial letter ⟨a⟩

(crosswords) across / (chiefly US) Alternative spelling of a.m. (“ante meridiem”) or am

Alternative form of -a (“empty syllable added to songs, poetry, verse and other speech”)

The name of the Cyrillic script letter А / а.

(idiomatic, slang) To make a telephone call. / (slang, with on) To inform, to call the authorities (on).

(idiomatic, US, colloquial) To leave without saying goodbye; leave quietly, run away; scram; depart without taking leave or notifying anyone, often with a connotation of avoiding something unpleasant or shirking responsibility.