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).
In the ether typically means being transmitted by radio from one place to another. (Radio waves being transmitted by it.) More generally in the sky or space.Ether is an alternative spelling of Aether the Greek word for the upper sky.Source(s): http://en.wikipedia.org/wiki/Aether_(cla... http://en.wikipedia.org/wiki/Luminiferou...nswers. Best Answer: In early scientific theories light was considered to be a wave. Since waves are disturbances of some kind of medium, and light can travel in a vacuum without air, scientists invented the concept of the luminiferous ether-a mysterious substance that allowed light waves to be transmitted.