Meaning

adjective open to or abounding in fresh air

adjective not practical or realizable; speculative

adjective having little or no perceptible weight; so light as to resemble air

originEtymology tree Proto-Indo-European *h₂ews- Proto-Indo-European *h₂ewsér Proto-Hellenic *auhḗr Ancient Greek ᾱ̓ήρ (āḗr)bor. Latin āēr Old French airbor. Middle English aire English air Proto-Indo-European *-kos Proto-Germanic *-gaz Proto-West Germanic *-g Old English -iġ Middle English -y English -y English airy From air + -y.

Etymology from Wiktionary, CC BY-SA 3.0