laud-

(Latin: praise, praising; glorify, glorifying; showing or expressing strong approval or admiration for something or someone)

Magna cum laude. (Latin term)
Translation: "With great distinction."
Magna cum laude is used with reference to a university or college graduating degree, diploma, etc.: Thomas was conferred with Magna cum laude after completion of his courses at his university, which was of a higher standard than the average honors presented, the highest distinction being "summa cum laude".
magnum cum laude
With great praise or distinction.

Used especially on a diploma to designate a grade of work higher than cum laude, but lower than summa cum laude.

summa cum laude. (Latin phrase)
Translation: "With the highest praise."

Normally a reference to graduates of schools or universities.

Tacent, satis laudant. (Latin)
Translation: "They are silent, they praise enough."

"Silence is praise enough" is a line from Terence's Eunuchus, and probably acknowledges that rapt attention in an audience can be more flattering than applause.