Quick Definition
although
Strong's Definition
and indeed, i.e. nevertheless or notwithstanding
Derivation: from G2532 (καί) and G4007 (περ);
KJV Usage: and yet, although
Thayer's Greek Lexicon
καίπερ (Treg. καί περ in Heb.; from Homer, Odyssey 7, 224 down), conjunc. (originally even very much, cf. Donaldson § 621; Bäumlein, p. 200f; Krüger, § 56, 13, 2; Buttmann, § 144, 23; Winers Grammar, § 45, 2 at the end), although; it is joined to a participle (in Greek writings sometimes also to an adjective, so that ὤν must be supplied): Php_3:4; Heb_5:8; Heb_7:5; Heb_12:17; 2Pe_1:12; contrary to ordinary usage (yet so occasionally in Greek writings) with a finite verb, καίπερ ἐστιν, Rev_17:8 Rec.; but since Griesbach καί παρέσται (correctly παρέσται (see in πάρειμι)) has been restored after the best manuscripts
Mounce Concise Greek Dictionary
καίπερ kaiper 5x
though, although; Php_3:4 ; Heb_5:8 ; Heb_7:5 ; Heb_12:17 ; 2Pe_1:12
Abbott-Smith Greek Lexicon
καίπερ ,
concessive particle,
[in LXX : Pro_6:8 , Wis_11:9 , Jon_1:13 , Mac.11 * ;]
although: c . ptcp ., Php_3:4 , Heb_5:8 ; Heb_7:5 ; Heb_12:17 , 2Pe_1:12 .†
Moulton & Milligan — Vocabulary of the Greek NT
καίπερ [page 315]
P Giss I. 47 .22 (time of Hadrian) ἃς μέντοι δεδώκεις εἰς το̣ῦτο̣ (δραχμὰς ) κ̄δ̄ ἔπεμψά σοι , καίπερ Διονυσ [ί ]ου τοῦ ἀργυροκόπου κατασχόντος μου ὅλας (δραχμὰς ) μ̄ , PSI IV. 298 .17 (iv/A.D.) καίπερ αὐτοῦ τὸ σύνολον μὴ ἐπιστα [μένου .
Liddell-Scott — Intermediate Greek Lexicon
καίπερ "although, albeit", mostly with a part., καίπερ πολλὰ παθών Od. ; often divided, καὶ οὐκ ἀγαθόν περ ἐόντα Il. ; καὶ κρατερός περ ἐών id=Il. ; in Trag. , with ὅμως added, καίπερ οὐ στέργων ὅμως id=Trag. , etc.
STEPBible — Tyndale Abridged Greek Lexicon
καίπερ concessive particle,
[in LXX: Pro.6:8, Wis.11:9, Jon.1:13, Mac.11 * ;]
although: with ptcp., Php.3:4, Heb.5:8 7:5 12:17, 2Pe.1:12.†
(AS)