Definition of inflections:
(n) :
(grammar, uncountable) The linguistic phenomenon of morphological variation, whereby terms take a number of distinct forms in order to express different grammatical features.
(n) :
(countable) Any specific type of morphological variation, which applies to a given class of terms.
(n) :
(countable) Any specific morphological form of a particular term, such as the principal parts for any given stem; any of the declined or conjugated forms that constitute its declension or conjugation.
(n) :
(countable) An affix representing a given variation.
(n) :
A change in pitch or tone of voice.
(n) :
(mathematics) A change in curvature from concave to convex or from convex to concave.