What is the meaning of the word "inflexion"?

This concept is central to many languages, where the form of a word changes to convey different meanings or grammatical structures, without adding separate words to express those variations.

Definitions:

In grammar, it's a way of adapting a word's form to fit its role in a sentence. NOUN
- The noun undergoes inflexion to form its plural, changing 'cat' to 'cats.'
In linguistics, denoted the modification of a word to express different grammatical categories such as tense, mood, voice, aspect, person, gender, and case. NOUN
- Learning the inflexions of verbs in Spanish is essential for proper conjugation.
In speech, affects the meaning or emotion behind words, indicating question, statement, irony, or emphasis. NOUN
- His speech was monotonous, lacking the inflexion that would have conveyed enthusiasm.
Refers to the modulation or variation in the pitch or tone of the voice. NOUN
- The subtle inflexion in her voice raised doubts about her certainty.