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Current approaches to morphology (field of studies in morphemes) conceive of morphemes as rules involving the linguistic context, rather than as isolated pieces of linguistic matter. They acknowledge that:

meaning may be directly linked to suprasegmental phonological units, such as tone or stress.
the meaning of a morpheme with a given form may vary, depending on its immediate environment.

When a morpheme stands by itself, it is considered as a root because it has a meaning of its own and when it depends on another morpheme to express an idea, it is an affix because it has a grammatical function.

Food for thought: Every word comprises one or more morphemes.


SIL's definition and examples

Wikipedia's definition