based on or subject to individual discretion or preference or sometimes impulse or caprice; "an arbitrary decision"; "the arbitrary rule of a dictator"; "an arbitrary penalty"; "of arbitrary size and shape"; "an arbitrary choice"; "arbitrary division of the group into halves"
the form of a word that is used to denote a singleton
being a single and separate person or thing; "can the singular person be understood apart from his culture?"; "every fact in the world might be singular...unlike any other fact and sole of its kind"-William James
grammatical number category referring to a single item or unit
composed of one member, set, or kind
the single one of its kind; "a singular example"; "the unique existing example of Donne's handwriting"; "a unique copy of an ancient manuscript"; "certain types of problems have unique solutions"
markedly different from the usual; "a peculiar hobby of stuffing and mounting bats"; "a man...feels it a peculiar insult to be taunted with cowardice by a woman"-Virginia Woolf
much greater than the normal; "abnormal profits"; "abnormal ambition"
not normal; not typical or usual or regular or conforming to a norm; "abnormal powers of concentration"; "abnormal amounts of rain"; "abnormal circumstances"; "an abnormal interest in food"
departing from the normal in e.g. intelligence and development; "they were heartbroken when they learned their child was abnormal"; "an abnormal personality"