caveat Look up caveat at Dictionary.com
1549, from L. "let him beware," 3rd pers. sing. pres. subjunctive of cavere "to beware, take heed, watch, guard against," from PIE base *skeue- "to pay attention, perceive" (cf. Skt. kavih "wise, sage, seer, poet;" Lith. kavoti "tend, safeguard;" Arm. cucanem "I show;" L. cautio "wariness;" Gk. koein "to mark, perceive, hear," kydos "glory, fame," lit. "that which is heard of;" O.C.S. chujo "to feel, perceive, hear," cudo "wonder," lit. "that which is heard of;" Czech (z)koumati "to perceive, be aware of;" Serbian chuvati "watch, heed;" O.E. sceawian "to look at;" M.Du. schoon "beautiful, bright," prop. "showy;" Goth. hausjan "hear").