G4914–συνήθεια–sunētheia

But ye have a custom that I should release to you one at the passover: will ye therefore that I release to you the King of the Jews?

συνήθεια sunētheia “a custom”

But there is not in every man that knowledge: for some with conscience of the idol to this hour eat it as a thing offered to an idol; and their conscience, being weak, is defiled.

συνηθείᾳ sunētheia “by custom”

But if any man seemeth to be contentious, we have no such custom, neither the churches of God.

συνήθειαν sunētheian “custom”