big-time I. \ˈ ̷ ̷| ̷ ̷\adjective 1.: of or relating to the big time 2.: outstanding, prominent, top-notch, first-class < her presentation was definitely big-time > II. \ˈ ̷ ̷ ˌ ̷ ̷ \adverb Etymology:big time : in a major or large-scale way < the new show bombed big-time > also : to a large degree < you owe me big-time >