You searched for: “equivalence
1. The fact of being the same, effectively the same, or interchangeable with something else.
2. In logic, the relationship that holds for two propositions that are either both true or both false, so that the affirmation of one and the denial of the other results in contradiction.
3. The relationship between two statements, both of which are either true or false, and each of which can be proven from the other.
This entry is located in the following units: equ-, equi- (page 4) valid-, val-, vale-, -vail, -valent, -valence (page 2)