"Illatively" is a term that describes a rational connection between two ideas or facts. Some synonyms for "illatively" include deductively, inferentially, logically, and conclusively. When two pieces of information are linked together by a cause-and-effect relationship, they can be said to be connected illatively. Other synonyms for this word include inferentially, compellingly, and reasonably. These terms all describe the process of drawing conclusions based on available evidence and using logic to connect those conclusions to other pieces of information. A strong ability to think illatively is an essential skill for success in many fields, including science, mathematics, and law.