Meaning

noun a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism

noun the surgical procedure of manually restoring a displaced body part

noun a car driven by a person whose job is to take passengers where they want to go in exchange for money

originLearned borrowing from Ancient Greek τάξις (táxis, “arrangement, order”).

Etymology from Wiktionary, CC BY-SA 3.0