1. To rely or depend on; SYN. count upon, bet on, rely on, rely upon, depend on, depend upon, look to, calculate on, reckon on.
2. When you need something important to happen or a certain condition to exist, you are counting on it. When you need someone to do something important, you are counting on that person.
3. When you rely on someone or something for help or support if you need it, you are counting on that thing or that person.
4. When you are certain than something will happen or that a certain condition will exist, you are counting on it.