1 If the invitation says black tie, women should wear a floor-length, evening gown. 2  A tuxedo is mandatory if you're a man. 3  This is your chance to dress as if you were headed to the Oscars. 4  Black tie optional means that wearing a tuxedo or long evening gown is not mandatory, but guests should feel free to do so.
Ether is an organic functional group consisting of a disubstituted oxygen, or an oxygen atom bonded to 2 carbon atoms (if adjacent to a ketone, functional group is then called an ester).
Full Definition of ETHEREAL. 1. a: of or relating to the regions beyond the earth b: celestial, heavenly c: unworldly, spiritual. 2. a: lacking material substance: immaterial, intangible c: suggesting the heavens or heaven. 3. : relating to, containing, or resembling a chemical ether.ull Definition of ETHEREAL. 1. a: of or relating to the regions beyond the earth b: celestial, heavenly c: unworldly, spiritual. 2. a: lacking material substance: immaterial, intangible c: suggesting the heavens or heaven. 3. : relating to, containing, or resembling a chemical ether.