The Oxford Thesaurus An A-Z Dictionary of Synonyms - alternativeadj.

1) alternate, variant, (an) other, different, additional; substitute, surrogate: Alternative models are available. --n. 2) alternate, variant, choice, option, selection; possibility; substitute, surrogate: The alternative was to remain at home and do nothing. You leave me no alternative. 'Esthetic' is an American spelling alternative.