Commandments in the Old Testament is the translation of the Hebrew word, mitsvah, meaning, constitute (together + place); enjoin, a charge to set out to be joined.

In the New Testatment, commandment is translation of a Greek word, referring to a set prescribed place for meeting, coming together, or joining. 

Therefore, throughout Scripture, a commandment is an injunction or charge to arrive at a set place where joining or marriage takes place.