The word 'vend' entered English in the early 17th century, borrowed directly from the Latin verb 'vendere', which means "to sell". This Latin term is itself a contraction of an older phrase: 'venum dare', literally "to give for sale". The first element, 'venum', is related to the concept of sale, while 'dare' means "to give". This etymological journey from a descriptive Latin phrase to a compact English verb illustrates a common process of linguistic streamlining. The modern, more specific meaning of selling via machines or in public spaces developed later, reflecting technological and commercial changes, while the broader legal sense preserves the original Latin scope.

The entire word 'vend' is a simplex morpheme. It is a loanword from Latin 'vendere', meaning "to sell". In English, it functions as a verb.