"Full retirement" means when a person has stopped working completely and is no longer employed. They have reached the age where they can stop working and enjoy their leisure time. Full definition
We calculate a basic amount as if you had reached full retirement age at the time you die. (ssa.gov)
Your benefits can be reduced for two reasons: if you take them before reaching full retirement age — which depends on when you were born — or if you earn too much money. (gobankingrates.com)
If you were born between 1943 and 1954, your normal retirement age for full retirement benefits is 66; that age rises if you were born later. (pnc.com)