Notice, warning (6)
I believe the answer is:
caveat
I believe this is a double definition.
'notice' is the first definition.
(caveat is a kind of notice)
'warning' is the second definition.
(caveat is a kind of warning)
(Other definitions for caveat that I've seen before include "Warning, eg to buyer" , "A caution, proviso" , "'Caution, warning (6)'" , "A warning against certain acts" , "Formal warning" .)