G4914–συνήθεια–sunētheia

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

συνήθεια sunētheia “a custom”

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

συνηθείᾳ sunētheia “by custom”

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

συνήθειαν sunētheian “custom”