Definition of "oho"

"There is Kate, taking no heed of anybody; sensible old darling — she goes at her tea and cake — Oho! she has not touched them!"

1880, Lucy Bethia Walford, Troublesome Daughters

"Oho, my boy, that's the woman who keeps you here! Mrs. Neff hinted at it, but I wouldn't believe it till I had it from you."

1914, Rupert Hughes, What Will People Say?

"Oho," he said, "a vile thing to say. It is. I am losing check upon my tongue, it is running free like a riderless horse. And I don't give a damn. I can say at last what I wanted for years to say, years of being politic and demure. No longer."

1988, Thomas Flanagan, The Tenants of Time

"Oho! Now I see where he's going with this, Frank thinks. Would have seen it earlier if I hadn't been so tired."

1997, Bruce A Shuman, Beyond the library of the future