c. 1300, compound of all + ready (adj.); literally "fully ready." Compare Norwegian, Danish allerede "already." Colloquial use in U.S. as a terminal emphatic (as in enough, already!) is attested from 1903, translating Yiddish shoyn, which is used in same sense. The pattern also is attested in Pennsylvania German and in South African.
1. He was already asleep in the bed, which smelled faintly of mildew.
2. The material consisted only of already published, unclassified information.
3. The country's politicians are already heaving a collective sigh of relief.
4. The scientists have already experimented at each other's test sites.