The word for today is…
inflection (noun) -
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
Source : Merriam-Webster
Etymology : Changing the pitch, tone, or loudness of our words are ways we communicate meaning in speech, though not on the printed page. A rising inflection at the end of a sentence generally indicates a question, and a falling inflection indicates a statement, for example. Another way of inflecting words is by adding endings: -s to make a noun plural, -ed to put a verb in the past tense, -er to form the comparative form of an adjective, and so on.
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