Meaning

noun a nation's ruler or head of state usually by hereditary right

noun large migratory American butterfly having deep orange wings with black and white markings; the larvae feed on milkweed

originFrom Middle French monarque, from Late Latin monarcha, from Ancient Greek μονάρχης (monárkhēs), variant of μόναρχος (mónarkhos, “sole ruler”), from μόνος (mónos, “only”) + ἀρχός (arkhós, “leader”), equivalent to mono- + -arch. * (butterfly): See monarch butterfly.

Etymology from Wiktionary, CC BY-SA 3.0