1Jo 1:6 我們若說是與神相交，卻仍在黑暗裡行，就是說謊話，不行真理了。
1Jo 1:7 我們若在光明中行，如同神在光明中，就彼此相交，他兒子耶穌的血也洗淨我們一切的罪。

1Jo 1:6 If1437 we say2036 that3754 we have2192 fellowship2842 with3326 him,846 and2532 walk4043 in1722 darkness,4655 we lie,5574 and2532 do4160 not3756 the3588 truth:225

1Jo 1:7 But1161 if1437 we walk4043 in1722 the3588 light,5457 as5613 he846 is2076 in1722 the3588 light,5457 we have2192 fellowship2842 one with another,240, 3326 and2532 the3588 blood129 of Jesus2424 Christ5547 his846 Son5207 cleanseth2511 us2248 from575 all3956 sin.266

"Strong":
G2842
κοινωνία
koinōnia
koy-nohn-ee'-ah
From G2844; partnership, that is, (literally) participation, or (social) intercourse, or (pecuniary) benefaction: - (to) communicate (-ation), communion, (contri-), distribution, fellowship.

Thayer Definition:
G2842
κοινωνία
koinōnia
Thayer Definition:
1) fellowship, association, community, communion, joint participation, intercourse
1a) the share which one has in anything, participation
1b) intercourse, fellowship, intimacy
1b1) the right hand as a sign and pledge of fellowship (in fulfilling the apostolic office)
1c) a gift jointly contributed, a collection, a contribution, as exhibiting an embodiment and proof of fellowship
Part of Speech: noun feminine
A Related Word by Thayer’s/Strong’s Number: from G2844
Citing in TDNT: 3:797, 447