Marked with a timestamp.

simple past tense and past participle of time-stamp

simple past tense and past participle of stamp out

simple past tense and past participle of rubber stamp

simple past tense and past participle of rubber-stamp

A small piece of printed paper stuck on an item to be mailed, indicating that postage has been paid. / (figuratively, colloquial) A very small area.

a revenue stamp

(figuratively) Of a person, organisation, or process, making decisions or approving matters routinely or without real power.

A piece of rubber or similar material with a design or text carved or molded for the purpose of transferring ink or dye to imprint that design on another object.

(figuratively) To process, approve or decide matters routinely rather than through careful consideration.