Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Latin
Origin: aether, from Greek aither, from aithein 'to catch fire'

ether

 noun
     
Related topics: Hospital
e‧ther
1 [uncountable]MH a clear liquid used in the past as an anaesthetic to make people sleep before an operation
2TD

the ether

a) TCB the space through which radio waves or computer signals travel:
voices coming through the ether
b) also aether British English literaryHA the upper part of the sky
Definition from the Longman Dictionary of Contemporary English
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