In reference to reason or cause: By reason of which, on account of which, wherefore; in consequence of which, from which, whereby, whence (as result…

= wherethrough, adv.

For what cause or reason? on what account? why? (Frequently with ellipsis; often coupled with why for emphasis.)

With connective force: On account of which, for which cause; wherefore.

For, by reason of, because of, or on account of which; wherefore (of, prep. 12 13). Chiefly in constructional dependence on certain classes of words.

= whereupon, adv. 2 3b Obsolete.

In consequence of, as a result of, or owing to which; from which (as a cause or reason); wherefore; sometimes practically equivalent to ‘so that’…

Of which, whereof (on, prep. 28). Obsolete.

(with clause as antecedent.) On which account, for which reason, wherefore; (of derivation or inference) from which, whence. Obsolete.

colloquial and regional. As a compound conjunction. = ‘on account of the fact that’; because. Cf. (on) account of at phrases 1h.

nonstandard and regional. (on) account of: (as a compound conjunction) = phrases 1d(b).