(1) A single statement or WFF is consistent if and only if it is logically possible for it to be true. (2) A set of one or more statements or WFFs is consistent if and only if it is logically possible for all the statements or WFFs in the set to be true at the same time.
(sometimes followed by `with') in agreement or consistent or reliable; "testimony consistent with the known facts"; "I have decided that the course of conduct which I am following is consistent with my sense of responsibility as president in time of war"- FDR
refers to assessment. Assessment is consistent where, given similar circumstances the assessor would make the same judgement again and the judgement will be similar to judgements that other assessors would make.