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noun in singular

the area covered by something:

〖時にan ～〗 (大きさ･重要性などの)程度, 範囲, 限度, 限界

e.g. an enclosure ten acres in extent.

the degree to which something has spread; the size or scale of something:

〖時にan ～〗 (場所の)広さ, 大きさ; 広がり

e.g. an in-depth survey will be carried out to establish the extent of the damage.

the amount to which something is or is believed to be the case:

e.g. everyone will have to compromise to some extent

e.g. they altered the document to such an extent that it contained little in the way of new policy.

Middle English (in the sense ‘valuation of property, especially for taxation’): from Anglo-Norman French extente, from medieval Latin extenta, feminine past participle of Latin extendere ‘stretch out’ (see extend).