συνεργέωsynergéō

to be a fellow-worker, i.e. co-operate

Greek (New Testament) · G4903

Meanings

1. properly, to work together (with): absolutely, Mark 16:20, 1 Corinthians 16:16, 2 Corinthians 6:1; with dative, James 2:22; dative commod., Romans 8:28, T, R, text (but see below).

2. In Hellenistic writers, transitive, to cause to work together (cf. ICC, in l.): with accusative of thing, Romans 8:28 [WH] R, margin (but see above).

Same root

συνεργόςsynergós · G4904a co-laborer, i.e. coadjutor

Where it appears

Appears 4 times in the Bible.

Romans 8:28 And we know that God causes everything to work together for the good of those who love God and are called according to his purpose for them.
1 Corinthians 16:16 to submit to them and others like them who serve with such devotion.
2 Corinthians 6:1 As God’s partners, we beg you not to accept this marvelous gift of God’s kindness and then ignore it.
James 2:22 You see, his faith and his actions worked together. His actions made his faith complete.

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.