United
来自Big Physics
late Middle English: from Latin unit- ‘joined together’, from the verb unire, from unus ‘one’.
wiktionary
From Old French unité, from Latin ūnītus, perfect passive participle of ūniō by substitution of -ed for Latin suffix.
etymonline
united (adj.)
"made into one," 1550s, past-participle adjective from unite (v.).