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.
1580s, from success + -ful. Originally any kind of success; since late 19c. it has tended to mean "wealthy" unless otherwise indicated. Related: Successfully.