circularise

From circular + -ise.

circularise (third-person singular simple present circularises, present participle circularising, simple past and past participle circularised)

1. Non-Oxford British English standard spelling of circularize.
   • 1961 December, M. J. Wilson, “Special train to Blackpool”, in Trains Illustrated, page 755:

     Proposing passengers were circularised with details of the excursion; [...].