NOTICE definition: an announcement or intimation of something impending; warning. See examples of notice used in a sentence.

US (also give (your) notice) to tell your employer or landlord that you will be leaving your job or your rented home, usually after a particular period of time:

To notice is to become aware of something that has caught one's attention: to notice a newspaper headline; to notice a road sign.

A notice is a formal announcement in a newspaper or magazine about something that has happened or is going to happen. I spotted a notice in a local newspaper.

5 days ago · notice (countable and uncountable, plural notices) (chiefly uncountable) The act of observing; perception. quotations

A formal announcement, notification, or warning, especially an announcement of one's intention to withdraw from an agreement or leave a job: gave my employer two weeks' notice; raised the …

There are 21 meanings listed in OED's entry for the noun notice, four of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.