Whether matrimony is fittingly named?

Objections

Objection 1 : It would seem that matrimony is unfittingly named. Because a thing should be named after that which ranks higher. But the father ranks above the mother. Therefore the union of father and mother should rather be named after the father.
Objection 2 : Further, a thing should be named from that which is essential to it, since a "definition expresses the nature signified by a name" (Metaph. iv, 28). Now nuptials are not essential to matrimony. Therefore matrimony should not be called nuptials.
Objection 3 : Further, a species cannot take its proper name from that which belongs to the genus. Now a joining [conjunctio] is the genus of matrimony. Therefore it should not be called a conjugal union.