Solemn High Mass.
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These terms distinguish the Form in question from that of Low Mass and Missa Cantata.
The parts assigned to the Deacon and Sub-Deacon are often done by Priests in Vestments, proper to those roles.
A Solemn Mass celebrated by a Bishop has its own particular Ceremonies and is referred to as a Solemn Pontifical Mass.
The terms "Solemn Mass," "Solemn High Mass," and "High Mass" are also often used within Anglo-Catholicism, in which the Ceremonial, and sometimes the Text, are based on those of The Sarum Rite or the later Tridentine Mass.