Hologram/ˈhəʊləɡræm,ˈhɑːləɡræm/ Definition 1 of 3Pro Tip 1/3Science Projects Used to describe sophisticated projects or visuals, including schoolwork. His presentation included a hologram that demonstrated the solar system. Pro Tip 2/3Cutting-edge Tech Implies advanced technology; often associated with future developments. The tech conference showcased a hologram that could be interacted with. Pro Tip 3/3Not Always Tangible Although 3D, holograms can’t always be touched—they lack physical form. I reached out to touch the hologram, but my hand passed right through it.