TERRAIN Meaning of TERRAIN in English [ tɛ'reɪn ]■ noun a stretch of land, especially with regard to its physical features.OriginC18: from Fr., from a pop. L. var. of L. terrenum , neut. of terrenus (see terrene ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004