extent · noun no plural /ɪkˈstent/Full view
B2 the size or importance of something
Dictionary examples:

They are just beginning to realize the full extent of the damage.

Her face was injured to such an extent that we didn't recognize her.

Rosie's teacher was impressed by the extent of her knowledge.

The River Nile is over 6500 kilometers in extent.

Learner example:

[For the] past couple of decades, TV has been diffused in Japan to such an extent that nowadays, one household is likely to have more than 2 TV sets that [show] a wide range of program[s] nearly 24 hours [a day]. (First Certificate in English; B2; Japanese)

to a great/large, etc. extent
B2 mainly
Dictionary example:

Their anger was to a large extent justified.

Learner example:

[In] bad, rainy weather, one might get wet and cold. On the other hand, this can be avoided to a large extent by wearing proper equipment. (First Certificate in English; B2; German)

to some extent/to a certain extent
B2 in some ways
Dictionary examples:

To some extent, she was responsible for the accident.

I agree with you to a certain extent.

Learner example:

To a certain extent, this point of view seems to be very respectable. (First Certificate in English; B2; French)

the extent to which
C2 the degree to which something happens or is likely to happen
Dictionary example:

The research should show the extent to which these changes are being implemented.

Learner example:

Several factors determine the extent to which a person's character may influence our own opinions and even our way of life, such as the time spent with that particular person, or the importance that figure has in our li[v]es. (Certificate of Proficiency in English; C2; Catalan)

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