Immunity/ɪˈmjuːnəti/ Definition 1 of 4Pro Tip 1/3Strengthening Health Refers to taking action to make one's body better at fighting illnesses. Eating healthy food helps in strengthening your immunity. Pro Tip 2/3Not Invincible Having strong immunity doesn't mean you'll never get sick. Even with good immunity, it's still important to get vaccinated. Pro Tip 3/3Beyond Personal Talking about 'community immunity' includes all people in an area. Vaccines contribute to community-wide immunity.