👉 In linguistics, "occlusion" is a term used to describe the difficulty in understanding or speaking a language. It refers to the lack of clear, direct, and understandable communication between speakers of different languages. Occlusion can be caused by differences in grammar, vocabulary, pronunciation, or nonverbal cues such as facial expressions or body language. The term was first used by linguist Charles Sanders Peirce in his work "The Principles of Linguistics."