minimum (adj.) Look up minimum at Dictionary.com
1810, from minimum (n.).
minimum (n.) Look up minimum at Dictionary.com
1660s, "smallest portion into which matter is divisible," from Latin minimum "smallest" (thing), neuter of minimus "smallest, least," superlative of minor "smaller" (from PIE root *mei- (2) "small"). Meaning "least amount attainable" is from 1670s.