To make something smaller or less in amount, degree, or size. The company plans to reduce its workforce by 10% this year.
To bring down the price or cost of something. The store decided to reduce the price of all winter clothing.
To simplify a mathematical expression or equation. You can reduce the fraction 4/8 to 1/2.
To concentrate or thicken (a liquid, especially a sauce) by boiling or simmering so that water evaporates. Simmer the broth until it reduces by half.
To lower the rank or status of someone or something. The officer was reduced in rank after the investigation.
(Chemistry) To cause (a substance) to gain electrons or decrease in oxidation state. Hydrogen can reduce copper(II) oxide to copper metal.
(Medicine) To restore a fractured or dislocated body part to its normal anatomical position. The orthopedic surgeon reduced the dislocated shoulder quickly.
To cause someone or something to be in a specified worse state or condition (often followed by "to"). The prolonged drought reduced the farmland to dust.