word, at a 1
in a word, once and for all, in short
2H4 III.ii.288 [Shallow to Falstaff] I have spoke at a word [i.e. I mean what I say]
Cor I.iii.110 [Virgilia to Valeria] No, at a word, madam
MA II.i.101 [masked Antonio to masked Ursula] At a word, I am not
MW I.i.100 [Shallow to Page, of Falstaff] He hath wronged me, indeed he hath, at a word, he hath
See also...
Discourse markers