A teammate is someone who works with you toward a shared goal as part of the same team. In sports, your teammates are the players wearing the same uniform, running the same plays, and celebrating the same victories. In a science project, your teammates are the classmates dividing up research tasks and building the presentation together.

A good teammate does their part reliably, encourages others when things get tough, and focuses on the team's success instead of personal glory. A talented player who hogs the ball and ignores teammates might score points but won't make the team better. A good teammate passes when someone else has a better shot, helps a struggling partner understand their math homework, or stays late to finish work so the group meets its deadline.

The word suggests that success rarely happens alone. Whether you're building a fort, rehearsing a play, or competing in a spelling bee relay, your teammates depend on you, and you depend on them. When everyone contributes their strengths and supports each other's weaknesses, the whole team becomes more capable than any individual could be alone.