odd

/ˈäd/

Middle English odde, from Old Norse oddi point of land, triangle, odd number; akin to Old English ord point of a weapon

adjective

  1. differing markedly from the usual, ordinary, or accepted : peculiar

  2. not regular, expected, or planned

  3. encountered or experienced from time to time : occasional

a very odd way to show gratitude

strange singular unique peculiar eccentric erratic odd quaint outlandish mean departing from what is ordinary, usual, or to be expected. strange stresses unfamiliarity and may apply to the foreign, the unnatural, the unaccountable. singular suggests individuality or puzzling strangeness.

interjection

  1. —used as a mild oath

abbreviation

  1. oppositional defiant disorder