(also in·flex·ion especially in BrE ) / ɪnˈflekʃn; NAmE / noun [ C , U ]
1.
a change in the form of a word, especially the ending, according to its grammatical function in a sentence
2.
a change in how high or low your voice is as you are speaking
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WORD ORIGIN
late Middle English (in the sense the action of bending inwards ): from Latin inflexio(n-) , from the verb inflectere bend in, curve, from in- into + flectere to bend.