Dictionary Definition:
Na2 [Ved. na=Idg. *ně; Lat. ne in n' unquam etc., Goth. ni; Sk. na ca=Lat. neque=Goth. nih. Also Sk. nā= Idg. *nē, cp. Lat. Goth. nē] negātive & adversative particle "not" (Nd2 326: paṭikkhepa; KhA 170: paṭisedhe) 1. often apostr. n': n' atthi, n' etaŋ etc.; or contracted: nāhaŋ, nāpi etc., or with cuphonic consonant y: nayidaŋ (It 29, J iv.3), nayidha (It 36, 37), nayimaŋ (It 15) etc. As double negation implying emphatic affirmation: na kiñci na all, everything Ji.295. -- 2. In disjunctive clauses: na . . . na neither -- nor, so -- or not so. In question: karoti na karoti ("or not") J ii.133. Cp. mā in same use. <-> Often with added pi (api) in second part: na -- nāpi neither -- nor ("not -- but also not") S ii.65; M i.246; Pv i.119. -- 3. In syntactic context mostly emphasized by var. negative & adversative particles, viz. nāpi (see under 2); n' eva indeed not, not for all that J iii.55; or not KhA 219; n' eva -- na neither -- nor D i.33, 35; Mi.486; A v.193; J i.207, 279; Vin ii.185; DhA i.328; ii.65; DA i.186, 188; n' eva -- na pana id. D i.24; na kho not indeed J ii.134; na ca but not (=this rather than that) J i.153; na tāva=na kho Vv 3713; na nu (in quest.= noune) is it not? PvA 74, 136; na no surely not Sn 224; na hi [cp. Gr. ou/xi/ not at all; nai/xicertainly] certainly not Dh 5, 184; Sn 666; Kh vii.6; na hi jātu id. Sn 152. -- See also nu, nū, no. -- 4, na is also used in the function of the negative prefix a -- (an -- ) in cases where the word -- negation was isolated out of a sentence negation or where a negated verb was substantified, e. g. (a) nacira (=acira) short, napparūpa abundant, napuŋsaka neuter, neka (=aneka) several; (b) natthi, natthika etc. (q. v.).