Time T

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 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.