the musical interval between one note and another four notes away from it
following the third position; number four in a countable series
coming next after the third and just before the fifth in position or time or degree or magnitude; "the quaternary period of geologic time extends from the end of the tertiary period to the present"
something inverted in sequence or character or effect; "when the direct approach failed he tried the inverse"
reversed (turned backward) in order or nature or effect
opposite in nature or effect or relation to another quantity ; "a term is in inverse proportion to another term if it increases (or decreases) as the other decreases (or increases)"