Phrase guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
No pronunciation record was provided for this word.
noun
A problem that has been posed in a field of study such as mathematics or theoretical computer science, but whose answer is not yet known.
Definition source: English Wiktionary via Wiktextract
Topics: sciences
No example sentence was provided for this meaning.
Synonyms: open question
Antonyms: none provided
History
No etymology was provided for this word.
