ease-in / EN
Gradual acceleration in the action. Visually is represented by editable curve and character of acceleration determines other names as quarter-in, quad-in, bounce-in, etc. Also known as slow-in.
ease-out / EN
Gradual deceleration in the action. Visually is represented by editable curve and character of deceleration determines other names as quarter-out, quad-out, bounce-out, etc.Also known as slow-out.