[ 'α:bɪt(rə)ri ]
■ adjective
1》 based on random choice or personal whim.
2》 (of power or a ruling body) autocratic.
3》 Mathematics (of a constant or other quantity) of unspecified value.
Derivatives
arbitrarily adverb
arbitrariness noun
Origin
ME: from L. arbitrarius , from arbiter 'judge, supreme ruler'.