Lengthening is a related term of prolongation.
As nouns the difference between lengthening and prolongation
is that lengthening is (linguistics) a type of sound change when a sound (especially a vowel) lengthens while prolongation is the act of prolonging.
As a verb lengthening
is .
lengthening
English
Noun
(
en noun)
(linguistics) a type of sound change when a sound (especially a vowel) lengthens
Verb
(head)
prolongation
English
Noun
(
en noun)
The act of prolonging.
That which has been prolonged; an extension.
References
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