Logical possibility is freedom from self-contradiction, explicit or implicit. Thus, a space of four dimensions is logically possible.

Logical possibility: that of a hypothesis not involving any self-contradiction.

Logical possibility is, according to usage, freedom from all contradiction, explicit or implicit; and any attempt to reform the inaccuracy would only bring confusion.

Logical possibility refers to a state of information in which nothing would be known of positive facts, except so much as is necessary to know the meanings of words and sentences.