Top definition
A combination of the words "brainwave" and "wavelength".

A train of thought; esp. when comparing those of two people who are sharing the same thought at the same time.
See also: "on the same wavelength"
"Are you thinking what I'm thinking?"
"...Nachos and Cool Whip!"
"Yes! We're definitely on the same brainlength."
by Marco262 April 18, 2006
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