correction · noun C or U /kəˈrek.ʃən/Full view
Nouns: correction, correctness, corrections
Adjectives: correct, incorrect, corrective
Verbs: correct
Adverbs: correctly, incorrectly
correction
B1 a change made to something in order to correct or improve it, or when you make such a change
Dictionary examples:

I made some corrections before handing in my essay.

She was disappointed to see her essay returned with a mass of corrections in red ink.

Learner example:

My new teacher is friendlier and he is more careful [with his] correction [of] the work and exams we do. (Preliminary English Test; B1; Swiss German)

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