# question mark

> English word · Noun · IPA /ˈkwɛstʃ(ə)n ˌmɑːk/

## Definitions
1. The punctuation mark "?", used at the end of a sentence to indicate a question.
2. A state of doubt or uncertainty.
3. An enigmatic, inscrutable, or mysterious person or thing; an enigma, a riddle.
4. Polygonia interrogationis, a North American nymphalid butterfly with a silver mark on the underside of its hindwing resembling a question mark (sense 1).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/question-mark