inflection

The definition of inflection is a change in pitch or tone of the voice.

(noun)

When your voice raises up at the end of a word to signify you are asking a question, this is an example of inflection.

See inflection in Webster's New World College Dictionary

noun

a turning, bending, or curving
a turn, bend, or curve
any change in tone or pitch of the voice; modulation: to signal a question by a rising inflection
a change of a curve or arc from convex to concave or the reverse
Gram.
1. the change of form by which some words indicate certain grammatical relationships, as number, case, gender, or tense
2. an inflected form
3. an inflectional element, as those bound forms used in English to form the plural and possessive case of nouns (ships, ship's) and the past tense and third person singular, present indicative, of verbs (he shipped, he ships)

Origin: L inflexio < inflexus, pp. of inflectere: see inflect

See inflection in American Heritage Dictionary 4

noun

The act of inflecting or the state of being inflected.
Alteration in pitch or tone of the voice.
Grammar
a. An alteration of the form of a word by the addition of an affix, as in English dogs from dog, or by changing the form of a base, as in English spoke from speak, that indicates grammatical features such as number, person, mood, or tense.
b. An affix indicating such a grammatical feature, as the -s in the English third person singular verb form speaks.
c. The paradigm of a word.
d. A pattern of forming paradigms, such as noun inflection or verb inflection.
A turning or bending away from a course or position of alignment.