Der`o*ga"tion (?), n. [L. derogatio: cf. F. d'erogation.]
The act of derogating, partly repealing, or lessening in value; disparagement; detraction; depreciation; -- followed by of, from, or to.
I hope it is no derogation to the Christian religion.
He counted it no derogation of his manhood to be seen to weep.
F. W. Robertson.
2. Stock Exch.
An alteration of, or subtraction from, a contract for a sale of stocks.
© Webster 1913.