Definition of "nonce"

[...] Dunce, / Dotard, a-dozing at the very nonce, / After a life spent training for the sight!

1855, Robert Browning, Childe Roland to the Dark Tower Came, section XXX

'Idiot!' exclaimed the doctor, who for the nonce was not capable of more than such spasmodic attempts at utterance.

1857, Anthony Trollope, chapter 6, in Barchester Towers

The protocol opens with A communicating in clear to AS his own claimed identity and the identity of the desired correspondent, B, together with A's nonce identifier for this transaction, IA1. ("Nonce" means "used only once.")

1978 December, Roger M. Needham, “Using Encryption for Authentication in Large Networks of Computers”, in Communications of the ACM, volume 21, number 12

The information gained by the eavesdropper would permit a replay attack, but only with a request for the same document, and even that may be limited by the server's choice of nonce.

1999, Network Working Group, RFC 2617 – HTTP Authentication: Basic and Digest Access Authentication, The Internet Society, page 22

Both CCM and GCM require a unique nonce (N used once) value to maintain their privacy and authenticity goals.

2006, Tom St Denis, Cryptography for Developers, page 340

The main idea with the challenge-response type of authentication protocol is that the challenge sent by the server is used only once (referred to as a cryptographic nonce, which means “number used once”).

2012, Steven Anson, Mastering Windows Network Forensics and Investigation

But particular men are not stereotyped for jobs nor particular desks (as against others) to sit at - the standard here is nonce.

1977, Robert Anderson Hall, David Morris Feldman, Homenaje a Robert A. Hall, Jr, page 75

Dickinson's association of heliotrope with Mary Bowles was nonce and fleeting, but the subject of gardens was always a safe one on which to address her: “How is your garden – Mary? Are the Pinks true –?”

2009, Judith FARR, Louise Carter, The Gardens of Emily Dickinson, page 55

Poplack et al. (1988, 57) found that 65% of their types were nonce and only 7% of the types were considered widespread.

2010, Susana Rivera-Mills, Juan Antonio Trujillo -, Building Communities and Making Connections, page 191

Some of the single-citation terms appeared to be nonce formations, that is, created for the occasion.

2018, James Lambert, “A multitude of ‘lishes’: The nomenclature of hybridity”, in English World-Wide‎, page 16

‘He's a nonce[. A] nonsense merchant, a paedophile[,’ Terry explained.]

2004, Jeffery Archer, A Prison Diary, St. Martin's Publishing Group, page 72