Abbreviation of attainable region theory.

A village and community in Carmarthenshire, Wales (OS grid ref SN4539).

A nonmetallic chemical element (symbol As) with an atomic number of 33. / (countable) A single atom of this element. / Arsenic trioxide.

(chemistry) Of or containing arsenic with a valence of 5.

(Britain, New Zealand, Australia, slang, offensive) A gay man; a male homosexual.

(Britain) Someone or something that is annoying or frustrating.

simple past tense and past participle of arse.

(Britain, New Zealand, Australia, Ireland, Newfoundland, vulgar, slang) bothered; willing to make an effort. / (vulgar, in combinations) Having a particular kind of arse

(current in South Africa, UK, Ireland, Canada (regional), Newfoundland, Australia, New Zealand, dated in New England, now vulgar) The buttocks or more specifically, the anus.

(slang, intransitive) To be silly, act stupid or mess around.