Meaning

verb attach a tag or label to

verb designate as if by a mark

verb be a distinctive feature, attribute, or trait; sometimes in a very positive sense

originFrom mark (“sign, characteristic, visible impression”) + -ed. Less common disyllabic pronunciation (/ˈmɑː.kɪd/) is likely an analogy derived from markedness (explaining its restriction to sense 2).

Etymology from Wiktionary, CC BY-SA 3.0