Definition of inflection
1
: change in pitch or loudness of the voice
2a
: the change of form that words undergo to mark such distinctions as those of case, gender, number, tense, person, mood, or voice
b
: a form, suffix, or element involved in such variation
c
: accidence
3
: the act or result of curving or bending : bend
4a
: change in curvature of an arc or curve from concave to convex or conversely
b
: inflection point
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Merriam-Webster unabridged
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Time Traveler for inflection
The first known use of inflection was in 1531
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