Laser/ˈleɪzər/ Definition 1 of 3Pro Tip 1/3Technical Precision The term implies high accuracy, often used in scientific and technical fields. The machine was aligned with a laser for precise measurements. Pro Tip 2/3Not Always Visible Lasers can be invisible, such as those used in remote controls. The remote works by sending an invisible laser signal to the TV. Pro Tip 3/3Safety Concerns Lasers can be dangerous, caution is needed when used in public contexts. Do not point the laser at anyone's eyes; it can cause harm.