admonitory comes from Latin admonitorius, from admonitor ('one who warns'), from admonere ('to warn, advise'), from ad- ('to') + monere ('to warn'). 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 adjective sense is "giving or conveying a warning or gentle reproof", 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 admonish, admonition, monitory, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Latin admonitorius, Latin monere, which anchor the explanation in named linguistic material.