The state a thing is in, and the requirement that must hold for something else to follow. Both are about what is presently the case.
Latin condicio (agreement, stipulation, state), from condicere (to talk together, agree), from com- (together) + dicere (to say); a state presently the case, and the requirement that must hold for another thing to follow.
Latin dicere is to say, and a condition was first something spoken and agreed between parties, not a fact discovered independently of anyone. Both senses the word carries now, a state and a requirement, are still, underneath, a kind of agreement about what counts as so.