The amount that a bin can hold; the capacity of a container.
From 'bin' (a container) + '-ful' (a suffix meaning 'the amount that fills'). Follows the pattern of words like 'handful' or 'spoonful.'
The suffix '-ful' is one of the most productive word-building tools in English—you can attach it to almost any container to create new measurements, which is why 'binful' is instantly understandable even if rarely written.
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