Meaning

noun a vegetable cut into thin strips (usually used as a garnish)

noun a clear soup garnished with julienne vegetables

verb cut into long thin strips

originFrom French julienne (1722), from given name Jules or Julien, presumably from an otherwise unknown chef of that name. Originally used in potage julienne (“Julienne potage, soup in the manner of Jules/Julien”), meaning “soup made from thin slices”; this sense is now known as chiffonade.

Etymology from Wiktionary, CC BY-SA 3.0