The word "pivotal" refers to something that is crucial or essential for the success or outcome of a situation. It indicates a central or key point upon which other things depend or change. For instance, a pivotal decision can significantly affect the direction of a project or argument.
The word "pivotal" comes from the noun “pivot,” which has its origins in the late Middle English word "pivot," derived from the Old French word "pivot," meaning "a pointed peg." The suffix "-al" denotes relating to, thus forming an adjective that signifies being connected to the core or center part.