... ingrain/engrain ingrain rec initialed, initialing (US); initialled, initialling (Br); Intl: initialed, initialing inoperable/inoperatable inoperable rec inquire/enquire; inquiry/enquiry inquire, inquiry ... interface, interoffice install, installed, installer, installing, installation are Br and US; but instalment in Br, installment in US; Intl: installment instil (Br); instill (US); Intl: instill; ... inadvisable rec incalculable/incalculatable incalculable rec incase/encase encase rec incise inclose/enclose enclose rec incur; incurred; incurring International English Language Guidelines 18...