| ALL | |
| abbr. | Acute Lymphoblastic Leukaemia; Additional Authorization List; Air Life Line |
| abbr. el. | airborne laser laboratory |
| abbr. file.ext. | Arts & Letters Library |
| abbr. med. | Acute Lymphoblastic Leukemia; acute lymphocytic leukemia; Antihypertensive And Lipid-Lowering |
| NYSE. | Allstate Corporation |
| physiol. | Allergy |
| problem | |
| abbr. | pb |
| IT | In IT, the unknown underlying cause of one or more incidents |