What is influction?

Answer 1

It's not anything because it is not a word. Did you mean inflection? That's the tone of your voice and the stress you put on words.

Influxtion would be the method by which Doc Brown time travels.

Answer 2

"Influction" seems to be a misspelling or a non-standard term. If you meant "inflection," it refers to changes in pitch, tone, volume, or speed of speech that convey grammatical information or shades of meaning. If you meant something else, please provide more context for clarification.