deduction

noun

1 the deduction of tax:

subtraction, taking away, taking off, withdrawal, abstraction, removal, debit, docking, discounting;

informal knocking off.

▷antonyms addition.

2 NI contributions are worked out on gross pay, before all deductions:

stoppage, subtraction.

3 she had been right in her deduction that he was in love with someone else:

conclusion, inference, supposition, hypothesis, thesis, assumption, presumption, suspicion, conviction, belief;

reasoning;

results, findings.

deduction Oxford Dictionary of English