1520s, "sounding together tunefully," from French harmonieux (14c.), from harmonie (see harmony). In nonmusical use from 1630s. Related: Harmoniously; harmoniousness.
1560s, "relating to music," from Latin harmonicus, from Greek harmonikos "harmonic, musical, skilled in music," from harmonia (see harmony). From 1660s as "tuneful, harmonious; relating to harmony" (earlier as armonical "tuneful, harmonious," c. 1500). The noun, short for harmonic tone, is recorded from 1777. Related: Harmonically.
It forms all or part of: adorn; alarm; aristarchy; aristo-; aristocracy; arm (n.1) "upper limb of the body;" arm (n.2) "weapon;" armada; armadillo; armament; armature; armilla; armistice; armoire; armor; armory; army; art (n.) "skill as a result of learning or practice;" arthralgia; arthritis; arthro-; arthropod; arthroscopy; article; articulate; artifact; artifice; artisan; artist; coordination; disarm; gendarme; harmony; inert; inertia; inordinate; ordain; order; ordinal; ordinance; ordinary; ordinate; ordnance; ornament; ornate; primordial; subordinate; suborn.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit irmah "arm," rtih "manner, mode;" Armenian arnam "make," armukn "elbow;" Greek arti "just," artios "complete, suitable," artizein "to prepare," arthron "a joint;" Latin ars (stem art-) "art, skill, craft," armus "shoulder," artus "joint," arma "weapons;" Old Prussian irmo "arm;" German art "manner, mode."
"loving harmony or music," 1813 (in the name of a society founded in London for the promotion of instrumental music), from French philharmonique (1739), from Italian filarmonico, literally "loving harmony," from Greek philos "loving" (see philo-) + ta harmonika "theory of harmony, music," from neuter plural of harmonikos (see harmonic). The Society name was taken up in the names of many symphony orchestras.