Lexical Definition

‎περ‎ per (per) indeed G:PRT
from the base of ‎πέραν‎

(whom-)soever.

Usage: 2 forms in 9 verses
Form Translated As     In Verse(s)
ἐάνπερ ἐάνπερ if indeed Heb.3.6Heb.3.14Heb.6.3
εἴπερ εἴπερ if indeed Rom.3.30Rom.8.9Rom.8.171Cor.8.51Cor.15.152Thess.1.6

Abbott-Smith

πέρ (akin to περί), enclitic particle, adding force or positiveness to the word which precedes it:
indeed, by far, etc. In the NT, it is always affixed to the word to which it relates, v.s. διόπερ, ἐάνπερ, εἴπερ, ἐπείπερ, ἐπειδήπερ, ἤπερ, καθάπερ, καίπερ, ὅσπερ, ὥσπερ.

Liddell-Scott-Jones

περ,

enclitic Particle, adding force to the word to which it is added, probably a shortened form of περ (which see) in the sense of

__A very much, however much.—Chiefly Epic dialect and Lyric poetry; also in Trag. with relats. and parts.:
__1 in [Refs 8th c.BC+] adjective and participle ὤν, ἐπεί μ᾽ ἔτεκές γε μινυνθάδιόν π. ἐόντα all shortlived as I am, [Refs 8th c.BC+]; φίλην π. ἐοῦσαν[περ} (which see), ἀγαθός π. ἐών">Refs] however brave thou art, [Refs]; κρατερός π. ἐών [Refs]; δουρικτητήν π. ἐοῦσαν[Refs]: so in Trag., ἄελπτά π. ὄντα [Refs 5th c.BC+]: with a substantive, ἀλόχῳ π. ἐούσῃ [Refs 8th c.BC+]: with adjective and substantive, λιγύς π. ἐὼν ἀγορητής [Refs 8th c.BC+] preceding, καὶ κρατερός π. ἐών [Refs]participle ὤν omitted, φράδμων π. ἀνήρ however shrewd,[Refs]; καὶ θεός π. [Refs 4th c.BC+]. however eager, [Refs 8th c.BC+]; καὶ ἀχνύμενός π. ἑταίρου grieved though he was for.., [Refs]
__2 intensive, ἐλεεινότερός π. more pitiable by far, [Refs]; μίνυνθά π. for a very little, [Refs]; πρῶτόν π. first of all, [Refs]; ὀψέ π. [Refs 5th c.BC+]. not even, not at all, οὐδ᾽ ὑμῖν ποταμός π. ἐΰρροος ἀρκέσει [Refs 8th c.BC+]; ἢν μή π. [Refs 5th c.BC+]
__3 to give emphasis, ἀλλὰ καὶ αὐτοί π. πονεώμεθα [Refs 8th c.BC+]: especially at any rate, τιμήν π. μοι ὄφελλεν ἐλλυαλίξαι honour (whatever else) he owed me, [Refs]; τόδε π. μοι ἐπικρήηνον ἐέλδωρ [Refs] at all events, [Refs]
__II after Conjs. and relative words, with which it commonly coalesces:
__II.1 after hypothetical Conjs., see at {εἴπερ}.
__II.2 after temporal Conjs., ὅτε π. just when, [Refs 8th c.BC+]; ὅταν π. [Refs 5th c.BC+]; πρίν π. before even, [Refs 8th c.BC+]
__II.3 after causal Conjs., see at {ἐπείπερ, ἐπειδήπε; δι᾽ τι π}. just because, [Refs 5th c.BC+]
__II.4 after relats., see at {ὅσπερ, οἷός περ, ὅσοσπερ, ἔνθαπερ, ὅθιπερ, οὗπερ, περ, ὥσπερ}.
__II.5 after the comparative particle, see at {περ, ἠέπερ}.
__II.6 after καί, see at {καίπερ}.
__B περ (B), Aeolic dialect for περ.