Quick Definition
κοινωνός, οῦ, ὁ, ἡ n.m. a sharer, partner
Strong's Definition
from 2839; a sharer, i.e. associate
KJV Usage: companion, X fellowship, partaker, partner
UBS Dictionary of the Greek New Testament
noun, m. | -οῦ | κοινόω
1 It is possible that συγκοινωνός[a] is somewhat more emphatic than κοινωνός in focusing upon the joint nature of participation.
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
κοινωνός, -7, dv, (κοινός), [as adj. Eur. Iph. Taur. 1173; commonly as subst. |; a. a partner, associate, com rade, companion: 2 Co. viii. 23; ἔχειν τινὰ κοινωνόν, Philem. 17; εἰμὶ κοινωνός τινι, to be one’s partner, Lk. v. 10; twos (gen. of pers.), to be the partner of one doing something, Ieb. x. 33; τινὸς ἐν τῷ αἵματι, to be one’s partner in shedding the blood etc. Mt. xxiii. 30. b. a partaker, sharer, in any thing; w. gen. of the thing: τῶν παθημάτων, 2 Co. i. 7; τῆς δόξης, 1 Pet. v.15; ϑείας φύσεως, 2 Pet. i. 45; τοῦ θυσιαστηρίου, of the altar (at Jerusalem) on which sacrifices are offered, i. e. sharing in the worship of the Jews, 1 Co. x. 18; τῶν δαιμονίων, partakers of (or with) demons, i. e. brought into fellow: ship with them, because they are the authors of the heathen worship, ibid. 20; (ἐν τῷ ἀφθάρτῳ κοινωνοὶ... ἐν τοῖς φθαρτοῖς, joint partakers in that which is imperishable ...in the blessings which perish, Barnab. ep. 19, 8; see κοινωνέω, fin.).
Mounce Concise Greek Dictionary
κοινωνός koinōnos 10x
a fellow, partner, companion, Mt. 23:30; Lk. 5:10; 1 Cor. 10:18, 20; 2 Cor. 8:23; Phlm. 17; Heb. 10:33; a sharer, partaker, 2 Cor. 1:7; 1 Pet. 5:1; 2 Pet. 1:4*
Abbott-Smith Greek Lexicon
κοινωνός, -ή, -όν
(< κοινός), [in LXX: Pr 28:24, Is 1:23 (חָבֵר), Ma 2:14 (חֲבֶרֶת), Es 8:13, al.;]
as adj., = κοινός.
As subst., ὁ, ἡ κ., a partner, associate, companion: II Co 8:23, Phm 17; c. dat. pers., Lk 5:10; c. gen. pers., He 10:33; id. seq. ἐν, Mt 23:30;
a partaker, sharer: c. gen. rei, I Co 10:18, 20, II Co 1:7, I Pe 5:1, II Pe 1:4 (v. Deiss., BS, 368 n2).†
Liddell-Scott-Jones — Greek-English Lexicon
κοινωνός (koinōnos) — participant. κοινων-ός, ὁ, also ἡ, companion, partner, τινος of or in a thing, [Refs 5th c.BC+]; ὁ τοῦ κακοῦ κ. accomplice in.., [Refs 5th c.BC+]; τινι in a thing, [Refs 5th c.BC+]
2. absolutely, partner, fellow, [Refs 5th c.BC+]; κοινωνοὶ λιμένων, of a societas publicanorum which farmed harbour-dues, [Refs]; of joint-owners, [Refs 2nd c.AD+]
3. familiar spirit, [LXX]
II. as adjective, ={κοινός},{ξίφος} [Refs 5th c.BC+]