Sufficient/səˈfɪʃnt/ Definition 1 of 2Pro Tip 1/3Quantity Focus Used when stressing the quantity needed to fulfill a requirement or condition. Do we have sufficient chairs for the meeting? Pro Tip 2/3Conditional Success Indicates the minimum needed for a task to be completed successfully. There's sufficient evidence to start the trial. Pro Tip 3/3Subjectivity What counts as sufficient can vary depending on a person's judgment or context. What's sufficient rest varies from person to person.