The word "tentative" refers to something that is not certain or fixed; it is provisional or subject to change. When someone has a tentative plan or agreement, it indicates that it is not yet finalized and may be altered in the future. This term can also imply hesitance or uncertainty about a decision or action.
The word "tentative" originated in the early 19th century, coming from the Latin "tentativus," which means "attempting." This is derived from "tentare," meaning "to try" or "to touch."