Cognoscible is an adjective that means capable of being known or comprehended. Synonyms for cognoscible include discernible, noticeable, perceivable, understandable, apprehensible, and graspable. These words all convey the idea that something is capable of being perceived or understood by the senses or by the mind. Other synonyms for cognoscible might include evident, obvious, clear, or apparent. Each of these words may emphasize a slightly different aspect of what it means for something to be capable of being known or comprehended, but they all point to the same basic idea of something being within the realm of human understanding.