Not evey of you are professional gamedesigners! So here are some nice reference to get what's going on in here! You can contribute new words and definitions!
Atomic parameters: precise ways to define how difficult you make actions in your games. It is bound what windiw of opportunity you give to players for an action.
Emotional Intelligence: "the capability of individuals to recognize their own emotions and those of others, discern between different feelings and label them appropriately, use emotional information to guide thinking and behavior, and adjust emotions to adapt to environments"
https://en.wikipedia.org/wiki/Emotional_intelligence
Game Design: Settings of rules and systems to get a game to be fun. Or interesting. Or challenging. Maybe.
Gameloop: Compelling successive activities in games that makes player go back and forth to those activities, one activity being the implied reward of finishing the other.
Game mechanic: features and systems inside a game that player will witness or interact with.
Metrics: mesurement of pretty much everything in a game. Distance, timing, it is often used in level design to adjust the difficulty and establish what player can and cannot access.
Player skills: the skills the player needs to face a challenge in games. You can find here a list of physical, mental and social skills. This site and projects aims at having emotional skills to challenge.
https://thinkgamedesign.com/gamer-skills/
Procedural Rethoric: Principle where every of your systems are telling your story, holding a message.
There is probably more! Please contribute, and ask questions!
Nice references: https://thinkgamedesign.com/game-design-formation/