All-or-none is a phrase used to describe a situation where there is no middle ground or compromise. Synonyms for this word include binary, dichotomous, and either-or. Binary refers to something that is made up of two parts or can be expressed in two different ways. Dichotomous is a more scientific term that describes a division into two mutually exclusive or contradictory groups. Either-or is a common phrase used to describe a decision between two options where only one can be chosen. Synonyms for all-or-none may be used in a variety of contexts, including technology, science, philosophy, and everyday conversation.