stepson

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stepson [noun]

the son of your husband or wife from a previous marriage

US /ˈstep.sʌn/ 
UK /ˈstep.sʌn/ 

Longman Dictionary of Contemporary English

stepson

stepson /ˈstepsʌn/ BrE AmE noun [countable]
a son that your husband or wife has from a relationship before your marriage
 

Oxford Advanced Learner's Dictionary

stepson

step·son [stepson stepsons]   [ˈstepsʌn]    [ˈstepsʌn]  noun
a son that your husband or wife has from an earlier marriage to another person 
Word Origin:

Old English stēopsunu (see step-, son).

Cambridge Advanced Learner's Dictionary

stepson / ˈstep.sʌn / noun [ C ]

the son of your husband or wife from a previous marriage

Collins Advanced Learner’s English Dictionary

stepson

[ste̱psʌn]
 stepsons
 also step-son
 N-COUNT: oft poss N

 Someone's stepson is a son born to their husband or wife during a previous relationship.

Merriam-Webster's Advanced Learner's Dictionary

stepson

step·son /ˈstɛpˌsʌn/ noun, pl -sons [count] : your wife's or husband's son by a past marriage or relationship