oddity UK /ˈɒdɪti/US /ˈɑdɪti/ noun3 •An odd or strange thing or opinion.An Avonside 0-4-4T with outside cylinders, bought by the S.M.A. in 1882 and scrapped in 1892 as a dismal failure, was one of the motive power oddities (some of them mortgaged). — 1961 •A strange person; an oddball. •Strangeness. formsoddities