1 working things out from the facts
ADJ. brilliant | logical | reasonable
VERB + DEDUCTION make
PREP. by ~ She arrived at this conclusion by logical deduction. | ~ about We can make some deductions about the history of the ruins.
PHRASES powers of deduction a detective with excellent powers of deduction | a process of deduction She arrived at the solution by a simple process of deduction.
2 taking an amount from a total/the amount taken
ADJ. monthly, weekly monthly deductions for health insurance | tax
VERB + DEDUCTION make The company automatically makes tax deductions from your salary.
PREP. ~ for deductions for travel costs | ~ from deductions from his wages