Frequently occurring or happening.

Regularly repeated in time.

Habitually done; customary action.

Commonly encountered or experienced.

Repeatedly mentioned or referred to.

Often: Frequently; many times or repeatedly.

Oftentimes: At various times; occasionally, but not always.

Oft-repeated: Said or done frequently without change.

Oft-mentioned: Referred to numerous times in conversation/writing.

Ofte (archaic): An old form of 'often'; less commonly used today.