The article considers the problems of graduating ontological and quantitative signs of the causal relationship; language means of expressing various degrees of their realisation are presented and classified. The article reveals that the gradual semantics of causation in the modern Russian language is expressed by a combination of constructions denoting the cause, with co-ordinative conjunctions, particles and introductory-modal words, and indicates the actual presence, the supposed presence, and the absence of a causal relationship, as well as the correlation of the situation of a consequence with one, two or many reasons.