'Notice' traces to Latin 'noscere' (to know) — the same root behind 'know,' 'noble,' and 'cognition.'
The fact of observing or paying attention to something; a formal announcement or warning; awareness or cognizance.
From Old French 'notice' (information, intelligence), from Latin 'nōtitia' (a being known, fame, knowledge, acquaintance), from 'nōtus' (known), past participle of 'nōscere' (to get to know, to become acquainted with), from earlier 'gnōscere,' from Proto-Indo-European *ǵneh₃- (to know). The same root gives 'know,' 'knowledge,' 'cognition,' 'recognize,' and 'noble' (originally 'well-known'). A notice is etymologically something that makes you know