Mortal/ˈmɔːrtl/ Definition 1 of 4Pro Tip 1/3Mortality and Time Use 'mortal' to emphasize something's limited duration or vulnerability to end. Our mortal existence makes every moment precious. Pro Tip 2/3Opposite of Eternal 'Mortal' often contrasts with 'immortal', spotlighting the finite nature of life or objects. While stories may be immortal, storytellers are mortal. Pro Tip 3/3Not Always Literal 'Mortal' can describe ideas or periods that will eventually end, not just living things. The mortal reign of the king ended with the revolution.