the state or quality of being serene, calm, or tranquil; sereneness.
2.
( usually initial capital letter ) a title of honor, respect, or reverence, used in speaking of or to certain members of royalty (usually preceded by his, your, etc.).
Origin: 1400–50;late Middle Englishserenite < Latinserēnitās. See serene, -ity
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a stew of meat, vegetables, potatoes, etc.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
1530s, of weather, 1590s, of persons," from Fr. sérénité, from L. serenitatem (nom. serenitas) "clearness, serenity," from serenus (see serene). Earliest use (mid-15c.) was as a title of honor for kings.