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 calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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.
not of a formal, official, or stiffly conventional nature: an informal luncheon
2.
appropriate to everyday life or use: informal clothes
3.
denoting or characterized by idiom, vocabulary, etc, appropriate to everyday conversational language rather than to formal written language
4.
denoting a second-person pronoun in some languages used when the addressee is regarded as a friend or social inferior: In French the pronoun "tu" is informal, while "vous" is formal