1. things that are accepted as true or as certain to happen, without proof
Usage: plural of assumption
2. the action of taking on or accepting responsibility, control, or a role
Usage: plural of assumption; formal

Examples

• The research was based on several key assumptions about consumer behavior.
• We need to challenge our assumptions about what students can achieve.
• His assumptions about the project timeline proved to be incorrect.
• The theory rests on assumptions that may not hold true in practice.
• Don’t make assumptions about people based on their appearance.
• The assumptions underlying the economic model were flawed.
• Her assumptions of leadership responsibilities came naturally to her.