Upright/ˈʌpraɪt/ Definition 1 of 5Pro Tip 1/2Physical positioning Used when something is perpendicular to the ground and often implies stability. Make sure the ladder is upright before you climb. Pro Tip 2/2Attention to posture Advises to straighten one's body for formality, health, or attentiveness. She sat upright during the interview to appear more professional.