forte (adj.) Look up forte at Dictionary.com
music instruction, "loud, loudly," from Italian forte, literally "strong," from Latin fortis "strong" (see fort). Opposed to piano.
forte (n.) Look up forte at Dictionary.com
1640s, fort, from French fort "strong point (of a sword blade)," from Middle French fort "fort, fortress" (see fort). Meaning "strong point of a person, that in which one excels," is from 1680s. Final -e- added 18c. in imitation of Italian forte "strong."