In its simplest form, abstinence is the decision not to have sexual intercourse. However, it does mean different things to different people. Some people might view abstinence as refraining from any and all sexual activity. Others might engage in outercourse, avoiding vaginal or anal penetration.
Source: Abstinence: What It Is, How to Do It, Risks to Consider, and More
As a chronic compulsive masturbator I love abstinence.
Replacing my wife’s pussy with my hand has been a joy!