say it: mah-juh-LAY-shuhn
modulation is a noun meaning "a musical passage moving from one key to another". It carries 5 recorded senses.
a musical passage moving from one key to another
(electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude or frequency or phase
electronics
rise and fall of the voice pitch
a manner of speaking in which the loudness or pitch or tone of the voice is modified
the act of modifying or adjusting according to due measure and proportion (as with regard to artistic effect)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for modulation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.