tending to ward off; "the swastika...a very ancient prophylactic symbol occurring among all peoples"- Victor Schultze

Conveying a caution, or warning to avoid danger; as, cautionary signals.

serving to warn; "shook a monitory finger at him"; "an exemplary jail sentence"

Wary; cautious.

With respect to wake turbulence, information transmitted to an aircraft on one of the following: (a) the possible location of wake turbulence; or(b) the location of a heavy or medium aircraft behind which it will pass or follow. Fr: avertissement

Given as a pledge or as security.