An ordinal number is a type of number that indicates position or rank in a sequence. The crossword solutions for the term 'ordinal number' are NTH (3 letters), FOURTH (6 letters), TWENTIETH (9 letters), SEVENTH (7 letters), TENTH (5 letters), SECOND (6 letters), FIFTH (5 letters), and THIRD (5 letters). These words all represent different positions in a sequence, with NTH representing any position, FOURTH representing the FOURTH position, TWENTIETH representing the twentieth position, SEVENTH representing the seventh position, TENTH representing the TENTH position, SECOND representing the SECOND position, FIFTH representing the fifth position, and THIRD representing the THIRD position.