Definition of "schwa"
noun:
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An indeterminate central vowel sound as the "a" in "about", represented as /ə/ in IPA and /@/ in SAMPA and X-SAMPA.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
The character ə, an upside-down, backwards, lower-case E.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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