TIME T n. 1. An unspecified but usually well-understood time, often used in conjunction with a later time T+1, or an earlier time T-1. "We'll meet on campus at time T or at Louie's at time T+1." 2. SINCE (OR AT) TIME T EQUALS MINUS INFINITY: A long time ago; for as long as anyone can remember; at the time that some particular frob was first designed.