UNDERSTANDING, n. A cerebral secretion that enables one having it to know a house from a horse by the roof on the house. Its nature and laws have been exhaustively expounded by Locke, who rode a house, and Kant, who lived in a horse.
His understanding was so keen
That all things which he'd felt, heard, seen,
He could interpret without fail
If he was in or out of jail.
He wrote at Inspiration's call
Deep disquisitions on them all,
Then, pent at last in an asylum,
Performed the service to compile 'em.
So great a writer, all men swore,
They never had not read before.
2007 Update: adj. Able and available to empathize with oneself in the company of others. This differs from SENSITIVE, the ability to sympathize, in a manner neither the empathetic nor the sympathic, nor those who use such words in conversation would understand or honor in any case. Tender hearted muttonheads!