Meaning

noun a conceptual whole made up of complicated and related parts

noun a compound described in terms of the central atom to which other atoms are bound or coordinated

noun (psychoanalysis) a combination of emotions and impulses that have been rejected from awareness but still influence a person's behavior

originFrom French complexe, from Latin complexus, past participle of complector (“to entwine, encircle, compass, infold”), from com- (“together”) and plectō (“to weave, braid”). May be analyzed as com- + -plex. See complect. Doublet of complexus.

Etymology from Wiktionary, CC BY-SA 3.0