Routledge Dictionary of Language and Linguistics
schwa (also neutral vowel)
From Hebrew 
, diacritical vowel sign for a missing vowel or for the unstressed [ә]. In English, schwa is an unstressed vowel produced with the tongue in its (neutral) resting position, e.g. [pәlayt] polite. In Bulgarian gălăb [´gәłәb], the first occurrence of schwa is stressed.
Reference
phonetics
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