The lowest unit of language that can convey meaning. You cannot break a morpheme down into anything smaller that has a meaning. Many simple words are morphemes. For example:
Child Shed Walk
Some words consists of two or more morphemes:
Child+ren child+ish
Walk+s walk+ing
ren, ish, s, ing all convey some meaning, even though none of them is a word in its own right. If we try to break them down any further we just end up with letters or sounds:
r+e+n i+s+h
None of these conveys meaning on its own.
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