The meaning of ON LINE is in or into operation. How to use on line in a sentence. ONLINE definition: 1. Online products, services, or information can be bought or used on the internet: 2. relating to…. Learn more. The city libraries are all online. He likes to engage in online chats/discussions. I went online to do a search for information about new cars. She spends a lot of her free time online. Play free online games at CrazyGames, the best place to play high-quality browser games. We add new games every day. Have fun! When you're online, you are using a computer or other device that's connected to the Internet. If someone asks if you're online, they're wondering whether you have Internet access. When a device is online, it is powered on and connected to a network, other devices, or the internet. The term applies to various electronics, including computers, smartphones, smart TVs, gaming consoles, and IoT devices. Play free online games at Poki, the 1 website for instant web games. Explore exclusive titles, popular favorites, and new game releases every day - no download needed!.