A — 1: κοινωνία
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(Strong's #2842 — Noun Feminine — koinonia — koy-nohn-ee'-ah )

(a) "communion, fellowship, sharing in common" (from koinos, "common"), is translated "communion" in 1—Corinthians 10:16; Philemon 1:6 , RV, "fellowship," for AV, "communication;" it is most frequently translated "fellowship;" (b) "that which is the outcome of fellowship, a contribution," e.g., Romans 15:26; 2—Corinthians 8:4 . See COMMUNION , CONTRIBUTION , etc.

Ephesians 3:9
A — 2: μετοχή
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(Strong's #3352 — Noun Feminine — metoche — met-okh-ay' )

"partnership" (akin to No. 3, under FELLOW), is translated "fellowship" in 2—Corinthians 6:14 . In the Sept., Psalm 122:3 , "Jerusalem is built as a city whose fellowship is complete." The word seems to have a more restricted sense than koinonia. Cp. the verb form in Hebrews 2:14 .

A — 3: κοινωνός
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(Strong's #2844 — Noun Masculine — koinonos — koy-no-nos' )

denotes "a partaker" or "partner" (akin to No. 1); in 1—Corinthians 10:20 it is used with ginomai, "to become," "that ye should have communion with," RV (AV, "fellowship with"). See COMPANION , PARTAKER , PARTNER.

B — 1: κοινωνέω
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(Strong's #2841 — Verb — koinoneo — koy-no-neh'-o )

"to have fellowship," is so translated in Philippians 4:15 , RV, for AV, "did communicate." See COMMUNICATE.

B — 2: συγκοινωνέω
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(Strong's #4790 — Verb — sunkoinoneo — soong-koy-no-neh'-o )

"to have fellowship with or in" (sun, "with," and No. 1), is used in Ephesians 5:11; Philippians 4:14 , RV, "ye had fellowship," for AV, "ye did communicate;" Revelation 18:4 , RV, "have (no) fellowship with," for AV, "be (not) partakers of." See COMMUNICATE , PARTAKER.