Arbitrarily/ˌɑːrbɪˈtrerəli/ Definition 1 of 2Pro Tip 1/3Seemingly Random Use when actions or decisions lack clear pattern or reason. The topics were arbitrarily assigned, leaving everyone confused. Pro Tip 2/3Unexpected Choices Perfect for describing selections made without obvious logic. The winner was arbitrarily chosen, surprising the audience. Pro Tip 3/3Chance Events Highlight the element of unpredictability in events or decisions. Numbers were arbitrarily drawn in the lottery.