Bible Dictionary
YEA
Yea is an affirmative word meaning “yes,” “certainly,” “also,” or “moreover.” In the New Testament, Jesus teaches that truthful speech should be confirmed simply by “yea” or “nay.”
Biblical Usage
The Old Testament uses several words translated “yea” with meanings such as also, moreover, and certainly. In the New Testament, Jesus teaches that ordinary truthful affirmation should be expressed by “yea” or “nay,” without a stronger oath.