Oxford Dictionary English alternate angles nounnoun BrE BrE//ɔːlˌtɜːnət ˈæŋɡlz// ; NAmE NAmE//ɔːlˌtɜːrnət ˈæŋɡlz// (also Z angles) [plural] (geometry) Add to my wordlistjump to other results enlarge image equal angles formed on opposite sides of a line that crosses two parallel lines, in the position of the inner angles of a Z compare corresponding anglesSee alternate angles in the Oxford Advanced American DictionaryCheck pronunciation: alternate angles oxfordlearnersdictionaries.com