In artificial intelligence, operations research, and related fields, a Linguistic value, (for some authors Linguistic variable) is a natural language term which is derived using quantitative or qualitative reasoning such as with probability and statistics or fuzzy sets and systems. In artificial intelligence, operations research, and related fields, a Linguistic value, (for some authors Linguistic variable) is a natural language term which is derived using quantitative or qualitative reasoning such as with probability and statistics or fuzzy sets and systems.