Lexical Definition

‎γνήσιος‎ gnḗsios (gnay'-see-os) genuine ^G:A
from the same as ‎γενέσια‎

own, sincerity, true.

• legitimate (of birth), i.e. genuine

Abbott-Smith

** γνήσιος, -α, -ον (< γίγνομαι), [in LXX: Si 7:18, III Mac 3:19 * ;]

1. prop., lawfully begotten, born in wedlock (in π., γυνὴ γ., a lawful wife; MM, s.v.).
2. true, genuine, sincere: Phl 4:3, I Ti 1:2, Tit 1:4; as subst., τὸ γ. = ἡ γνησιότης, sincerity, II Co 8:8.†

Abbott-Smith References

Liddell-Scott-Jones

γνήσιος-ος, α, ον,

(γένος) belonging to the race, i. e. lawfully begotten, born in wedlock, νόθον καὶ γνήσιοςον [γνήσιοςα 5th c.BC: Euripides Tragicus “Hippolytus” 309; γ. φρόνημα 5th c.BC: Sophocles Tragicus “Fragmenta” 307. ">Refs 8th c.BC+]

__2 generally, genuine, legitimate, φίλος [Refs 6th c.BC+] A; γ. γυναῖκες lawful wives, opposed to παλλακίδες, [Refs 5th c.BC+]; γ. τῆς Ἑλλάδος true Greeks, [Refs 4th c.BC+]; μήτηρ τῶν ἐρωτικῶν λόγων, of Aphrodite, [Refs 2nd c.AD+]; γ. ἀρεταί real, unfeigned virtues, [Refs 5th c.BC+]; γ. ὕμνοι inspired song, [Refs 5th c.BC+]; of fevers, γ. τριταῖος a genuine tertian, [Refs 5th c.BC+]; γ. ὄξος genuine vinegar, [Refs 4th c.BC+]; of writings, genuine, [Refs 1st c.AD+] adverb -ίως genuinely, truly, [Refs 5th c.BC+]; γ. φέρειν bear nobly, [Refs 4th c.BC+]; lawfully, τοῖς γ. συμβιώσασιν [Refs 1st c.BC+]
__II γνήσιοςα, τά, charges on land, γ. δημόσια [Refs 1st c.AD+]