συλλογίζομαιsyllogízomai

to reckon together (with oneself), i.e. deliberate

Greek (New Testament) · G4817

Meanings

1. to compute.

2. to reason: Luke 20:5.

Same root

σύνsýn · G4862with or together (but much closer than G3326 (μετά) or G3844 (παρά)), i.e. by association, companionship, process, resemblance, possession, instrumentality, addition, etc.
λογίζομαιlogízomai · G3049to take an inventory, i.e. estimate (literally or figuratively)

Where it appears

Appears 1 times in the Bible.

Luke 20:5 They talked it over among themselves. “If we say it was from heaven, he will ask why we didn’t believe John.

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