Lewis Short
(adverb) : necnĕ, neque-ne
* Or not, is used in the second half of a disjunctive interrogation, corresponding to -ne or utrum, and also without a corresp interrog, particle in the first half (usually in indirect interrogations, and without repeating the verb).
* In indirect interrogations.
* Without a verb: quaero, potueritne Roscius ex societate partem suam petere necne,Cic. Rosc. Com. 17, 52: jam dudum ego erro, qui quaeram, utrum emeris necne,Cic. Verr. 2, 4, 16, § 35: utrum proelium committi ex usu esset necne,Caes. B. G. 1, 50: nunc habeam necne, incertum est,Ter. Heaut. 1, 1, 43: posset agi lege necne pauci quondam sciebant,Cic. Mur. 11, 25: accipiat enim actionem necne ad eventum pertinet,Quint. 3, 6, 73; cf. id. 1, 4, 21; and Spald. on 7, 3, 30: idcirco quidam, comoedia necne poëma Esset, quaesivere,Hor. S. 1, 4, 45.
* In a direct interrogation (rare): sunt haec tua verba necne?Cic. Tusc. 3, 18, 41.
Charlton T. Lewis, Charles Short, A Latin Dictionary