Actions are the core tools a player has to influence the game. Camera control, avatar movement, jumping, all these can make up the actions of your game. The core loop of any game is to have a goal, do an action to try to progress, and process the resulting feedback into more actions.
In Yahtzee, there are a small number of actions that form the core gameplay loop.
A game without actions is like a sentence without verbs - nothing happens. Deciding the actions in your game will be the most fundamental decision you can make as a game designer. Tiny changes to these actions will have tremendous ripple effects with the possibility of either creating marvelous emergent gameplay or making a game that is predictable and tedious. Choose your actions carefully, and learn to listen to your game and your players to learn what is made possible by your choices. - Jesse Schell, The Art of Game Design
The lens is industry standard.