wherein

UK: /wɛərˈɪn/ US: /hwɛrˈɪn, ˈwɛr-/ ,(hwâr in′, wâr-)

WordReference Random House Learner's Dictionary of American English © 2026

where•in /hwɛrˈɪn, ˈwɛr-/   conj. 

1. in what or in which.

adv. 

2. in what way or respect.

WordReference Random House Unabridged Dictionary of American English © 2026

where•in  (hwâr in′, wâr-), conj. 

1. in what or in which.

adv. 

2. in what way or respect?

• Middle English wherin. See where, in 1200–50

Collins Concise English Dictionary © HarperCollins Publishers::

wherein / wɛərˈɪn/ adverb

1. in what place or respect?

pronoun

1. in which place, thing, etc