semi-aˈttached,ppl.a. [semi- 1.] Partially or loosely attached; also, = semi-detached (mod. Dicts.). 1860Thackeray Lovel ii, I say, why didn't I say this to her? She would have come, I feel sure she would. We would have been semi-attached as it were.1860[Emily Eden] (title) The Semi-Attached Couple.