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v. de·duct·ed, de·duct·ing, de·ducts
1. To take away (a quantity) from another; subtract.
2. To derive by deduction; deduce.
To take away a desirable part: Poor plumbing deducts from the value of the house.

[Middle English deducten, from Latin dēdūcere, dēduct-, to lead away or down; see deduce.]
References in classic literature ?
On the mother's death, the money from which her income had been derived was to go to Andrew and Selina, in the same relative proportions as before -- five thousand pounds having been first deducted from the sum and paid to Michael, as the sole legacy left by the implacable father to his eldest son.
The trembling clown replied that as he lived and by the oath he had sworn (though he had not sworn any) it was not so much; for there were to be taken into account and deducted three pairs of shoes he had given him, and a real for two blood-lettings when he was sick.
He deducted, however, from Passepartout's share the cost of the gas which had burned in his room for nineteen hundred and twenty hours, for the sake of regularity.
No; let the sum of twenty guineas which he had stolen be deducted from his share, and then let the sum of three guineas be put back from it, seeing that his mother had always considered three of the twenty guineas as his; and, though he had run away, and was, perhaps, gone across the sea, let the money be left to him all the same, and be kept in reserve for his possible return.
Colbert, who deducted the other six thousand francs, condescended to allow me to take fifty pistoles as a gratification; so that, if it were not for my little estate at Montlezun, which brings me in twelve thousand francs a year, I could not have met my engagements.
A safe passage through the Northwest posts was guaranteed to such as did not choose to enter into the service of that Company, and the amount of wages due to them was to be deducted from the price paid for Astoria.
Therefore a bad poet would, I grant, make a false critique, and his self-love would infallibly bias his little judgment in his favor; but a poet, who is indeed a poet, could not, I think, fail of making-a just critique; whatever should be deducted on the score of self-love might be replaced on account of his intimate acquaintance with the subject; in short, we have more instances of false criticism than of just where one's own writings are the test, simply because we have more bad poets than good.
I would not, therefore, on my account, have you encumber one moment of your precious time by sending for her to Edward Street, especially as every visit is so much deducted from the grand affair of education, which I really wish to have attended to while she remains at Miss Summers's.
Hire was always charged up to the hour of return to the shop and deducted from the deposit.
Then there was well-bred economy, which in those days made show in dress the first item to be deducted from, when any margin was required for expenses more distinctive of rank.
I'll grease the surveyor's palm--give him a hundred rubles, or a hundred and fifty, and he'll reckon that there are some five desyatins of glade to be deducted.
This was a fine adjustment, for by working hammer-and- tongs through a twelve-hour day, after freight had been deducted from the selling price of the wood in Los Angeles, the wood-chopper received one dollar and sixty cents.