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 screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a scrap or morsel of food left at a meal.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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.
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.