#1 reduce v. [cut down, cut back, trim, trim down, trim back, cut, bring down] cut down on; make a reduction in; "reduce your daily fat intake"; "The employer wants to cut back health benefits". wn
#2 reduce v. make less complex; "reduce a problem to a single question". wn
#3 reduce v. bring to humbler or weaker state or condition; "He reduced the population to slavery". wn
#4 reduce v. simplify the form of a mathematical equation of expression by substituting one term for another. wn
#5 reduce v. lower in grade or rank or force somebody into an undignified situation; "She reduced her niece to a servant". wn
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