Definition of "godspeed"

At the threshold of death, how dare I give you permission to go to England, to cross the seas? But I will not stand in your way. It is your mother's permission which really matters. If she permit you, then godspeed! Tell her I will not interfere. You will go with my blessings.

1927, M[ohandas] K[aramchand] Gandhi, “Preparation for England”, in Mahadev Desai, transl., The Story of My Experiments with Truth: Translated from the Original in Gujarati, volume I, Ahmedabad, Gujarat: Navajivan Press, part I, page 95

So, class of 2007, join in. And godspeed.

2007 May 12, Peter Steinfels, “At commencement, a call for religious literacy”, in The New York Times‎, New York, N.Y.: The New York Times Company, archived from the original on 2022-11-26

Mr. C[harles] C[rozat] Converse's new pronoun [thon] of the singular number and common gender has met with a warm welcome from philologists and the press. […] The new word has received a number of godspeeds, some of which we quote.

1884 November 1, “Thon”, in J[eanette] L[eonard], J[oseph] B[enson] Gilder, editors, The Critic: A Literary Weekly, Critical and Eclectic, volume II, number 44, New York, N.Y.: The Good Literature Publishing Co., page 210, column 1

Eight years before he had seen his friend off at the North Wall and wished him godspeed.

1914 June, James Joyce, “A Little Cloud”, in Dubliners, London: Grant Richards, page 84

I udn't mind seeing her come in when I was in the godspeed of washday, and that's saying something.Originally published in Over to Candleford (1941).

1939, Flora Thompson, “‘A Bit of a Tell’”, in Lark Rise to Candleford: A Trilogy, London: Penguin Books, published 1973, page 291