early 15c., "information, intelligence," from L. notitia
"a being known, fame, knowledge," from notus
"known," pp. of (g)noscere
"come to know, to get to know, get acquainted (with)," from PIE *gno-sko-
, a suffixed form of root *gno-
). Sense of "formal warning" is attested from 1590s. Meaning "a sign giving information" is from 1805. The verb is attested from mid-15c., originally "to notify;" sense of "to point out" is from 1620s. Meaning "to take notice of" is attested from 1757, but was long execrated in England as an Americanism (occasionally as a Scottishism, the two crimes not being clearly distinguished).