Grandfather/ˈɡrænfɑːðər/ Definition 1 of 3Pro Tip 1/3Gender Specific Grandfather refers specifically to a male relative; there's no female equivalent for this term. Her grandfather, not grandmother, served in the war. Pro Tip 2/3Two Generations Up Grandfather indicates a direct ancestor two generations above you, not just any older relative. I learned gardening from my grandfather, my mom's dad. Pro Tip 3/3Affectionate Term Often used endearingly for someone who may not be a relative but is old and cherished. We all call him grandfather because he's so caring.