The book gives four ways an expression may count as mufrad. In the first, no relevant constituent of the expression exists to carry part of the intended meaning. For an illustrative example, the one-letter Arabic conjunction wa (“and”) is not divided into two meaningful expression-parts. This is only one possible form, not a requirement that every mufrad be a one-letter word.
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First form: no relevant constituent
Simple and Composite Expressions: Definitions, Four Forms, and Examples
The book gives four ways an expression may count as mufrad. In the first, no relevant constituent of the expression exists to carry part of the intended meaning. For an illustrative example, the one-letter Arabic conjunction wa (“and”) is not divided into two meaningful expression-parts. This is only one possible form, not a requirement that every mufrad be a one-letter word.