Learn what the difference is between .com, .net, .org, .co, and .us domain types and what makes them so popular. Discover which one to choose for your business. What does “care of” mean in a letter address? Let’s have a closer look. Meaning “Care of” means by the way of someone or through someone. It is often abbreviated “ c/o .” This is used when something is being delivered to an address where they don’t normally receive mail. It is a way of letting the post office know the recipient is not the normal recipient at that address. Use You begin addressing the letter as usual. The recipient’s name goes on the first line. Then, you ... Learn the meaning, abbreviation and usage of c / o , which means through or by way of someone. See examples of c / o in business, hotel and event invitation scenarios. C / O is an abbreviation for "care of", used in addresses and correspondence when the recipient is staying at someone else's home or receiving mail through a third party. Learn the origin, context, and other meanings of C / O , as well as related terms and examples.