abstain comes from Old French abstenir ('to hold back'), from Latin abstinēre ('to withhold'), from abs- ('away') + tenēre ('to hold'). Morphologically, the word is transparent as a compound: its parts remain visible in the modern spelling, while the older history of those parts supplies the deeper ancestry. In modern use, the verb sense is "to restrain oneself from doing or partaking in something", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as abstinence, abstemious, retain, contain and derivatives such as abstainer, abstention, abstinence, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Latin abstinēre, Latin tenēre, Proto-Indo-European *ten-, which anchor the explanation in named linguistic material.