UBS Dictionary of the Greek New Testament

Sense 1: to bring about an agreement, to cause an agreement

Semantic entry: 31.21

Semantic domains: Hold a View, Believe, Trust

Subdomains: Agree, Consent

Definition: to bring about a mutually accepted agreement between two or more parties, with the probable additional component of making something certain

Notes: Since one who was a μεσίτης (31.22: μεσίτης) often acted as one who provided the surety or guarantee of an agreement or arrangement, there is a significant component of certainty involved in μεσιτεύω. Hence, one may understand this as implying not only the agreement but the guarantee of its validity.