concerning, about, respecting, with regard to, with respect to, with reference to, on or in the matter of, pertaining to, on the subject of, apropos, re, Law in re, Archaic or Scots anent, Dialect anenst:
We have received your letter regarding poor service.
Regarding your claim, the processing of it has been delayed because you failed to sign the form.
1 Sometimes, regardless of. despite, notwithstanding; in spite of, heedless of, Non-Standard irregardless:
Regardless of her father's protestations, she continued to go out with William.
2 notwithstanding, nevertheless, no matter what, in any event, in any case, at all events, anyway, anyhow, Non-Standard irregardless:
She heard his threats but is going out with William regardless.