open question

British  

noun

1. a matter which is undecided

2. a question that cannot be answered with a yes or no but requires a developed answer

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open question Idioms  

1. An unresolved issue, one that has not been finally determined. For example, Whether the town should pave all the unpaved roads remains an open question. In the mid-1800s this term acquired a specific meaning in the British Parliament, that is, “an issue on which members may vote independently, without respect to their party affiliation.”

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Example Sentences

Whether or not the overnight moves would carry through to Thursday’s market open remained an open question, given the barrage of back-and-forth headlines that investors have been fielding recently.

From MarketWatch

Explaining this discrepancy is now an important open question for researchers.

From Science Daily

Whether the war’s early unpopularity will change the course of events, though, remains an open question.

From Slate

Hims faces investigations from other federal agencies beyond the FDA and Justice Department, “and what happens to those processes is an open question,” Hill wrote.

From Barron's

As part of this, we are tackling the open question of how centromeres assemble the kinetochore.

From Science Daily