(n) Conduct (as fairness, respect for one's opponent, and graciousness in winning or losing) becoming to one participating in a sport. https://www.merriam-webster.com/dictionary/sportsmanship
First known use 1897, derives from the words sportsman and ship.
Sportsmanship is hoping that a sport or activity will be enjoyed for its own sake, with proper care for fairness, ethics, respect, and a sense of fellowship with one's competitors. letting everyone have their moment or shot. Maintaining self-control, having pride and just enjoying yourself.
Sportsmanship to me is passing the puck, rather than shooting it. Its talking to a buddy, even after he just beat you in overtime. congratulating your line mate on getting the game puck, or even shaking the officials hand and thanking him.
Sportsmanship is Just showing good fellowship and courtesy towards others. People who show bad sportsmanship show immaturity. Taking a loss and still having fun shows maturity and is selfless.
Bad sportsmanship is also just looked at as a poor sport or sore loser which is just having no respect, blames others, and cant take losing. Sportsmanship is also just not being selfish, not without ethics.