Yea is an affirmative word meaning also, moreover, certainly, doubtless, verily, yes, or however, according to context. It is used to confirm or reinforce a statement.
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.
The English word represents several Hebrew and Greek particles whose meanings include affirmation, addition, contrast, and “also.”