Lexical Definition

‎ἐπιστήμων‎ epistḗmōn (ep-ee-stay'-mone) knowing G:A
from ‎ἐπίσταμαι‎

endued with knowledge.

Usage: 4 forms in 5 verses
Form Translated As     In Verse(s)
ἐπιστήμων understanding Jas.3.13
επιστήμων intelligent LXX.Deut.4.6
επιστήμονεσ having knowledge LXX.Isa.5.21
επιστήμονασ having knowledge LXX.Deut.1.13LXX.Deut.1.15

Abbott-Smith

ἐπιστήμων, -ον, gen., -ονoς (ἐπίσταμαι) [in LXX: De 1:13 4:6, Is 5:21 (בִּין ni.), I Es 8:44, Si 10:25 21:15, etc. ;]
knowing, skilled: Ja 3:13.†

Abbott-Smith References

Book Refs
Deuteronomy 1:13 · 4:6
Isaiah 5:21
James 3:13

Liddell-Scott-Jones

ἐπιστήμων-ων, ον,

genitive ονος, (ἐπίσταμαι) knowing, wise, prudent, . βουλῇ τε νόῳ τε [Refs 8th c.BC+]; ἐπιστήμωνων γὰρ εἶ, ={ἐπίστασαι γάρ}, [Refs 5th c.BC+]

__2. acquainted with a thing, skilled or versed in, with genitive, κακῶν [Refs 5th c.BC+]; τῆς θαλάσσης, τοῦ ναυτικοῦ, [Refs 5th c.BC+]; τῆς τέχνης [Refs 5th c.BC+]; also περί τινος or τι, [Refs 5th c.BC+]: with neuter adjective, τὰ προσήκοντα ἐπιστήμωνων [Refs 5th c.BC+]
__3. with infinitive, knowing how, λέγειν τε καὶ σιγᾶν [Refs 5th c.BC+]: comparative -ονέστερος[Refs 5th c.BC+]. adverb comparative -ονέστερον[Refs 5th c.BC+]: superlative -ονέστατα[Refs 5th c.BC+]
__II. possessed of perfect knowledge, [Refs 4th c.BC+], scientifically versed in a thing, [Refs]. adverb -ονως, ἔχειν πρός τι [Refs 5th c.BC+] with science, with art, [Refs]; εἰπεῖν use technical or scientific terminology, [Refs 2nd c.AD+]