Origin: 1790–1800; < Latinsenect(ūs) old age (equivalent to senec-, extracted as stem from senex (genitive senis) old man + -tūs abstract noun suffix) + -i- + -tude, on model of plenitude, rectitude, etc.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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.