Briton; English person
Refers to a person from Britain or England. Often used in formal or written contexts; in casual speech イギリス人 is more common.
He is British, but his Japanese is very good.
Compound of 英 (England/Britain) and 人 (person). The kanji 英 is an abbreviation of 英吉利 (イギリス), an ateji representation of 'English'.