The following abbreviations are used throughout Record of Pennsylvania Volunteers in the Spanish-American War, 1898. They are provided here for you as an explanation to the meaning of the abbreviation.
| A. A. A. G. | Acting Assistant Adjutant General. |
| A. A. G. | Assistant Adjutant General |
| A. C. | Army Corps. |
| A. D. C. | Aide-de-Camp. |
| A. G. O. | Adjutant General’s Office. |
| A. G. | Adjutant General. |
| Actg. | Acting. |
| Adj. | Adjutant. |
| Amb. | Ambulance. |
| Apptd. | Appointed. |
| Artf. | Artificer. |
| Arty. | Artillery. |
| Asst. | Assistant. |
| Battn. | Battalion. |
| Baty. | Battery. |
| Brig. | Brigadier. |
| C. S. | Commissary of Subsistence |
| c. s. | Current Series. |
| Cal. | California |
| Capt. | Captain. |
| Cavy. | Cavalry. |
| Cert. | Certificate. |
| CO. | Company. |
| Col. | Colonel. |
| Colo. | Colorado. |
| Comd. | Commander. |
| Comdg. | Commanding. |
| Comsd. | Commissioned. |
| Comy. | Commissary. |
| Corp. | Corporal. |
| Dept. | Department. |
| det. | Detached. |
| Dischd. | discharged |
| Dist. | District. |
| Div. | Division. |
| Enrd. | Enrolled. |
| Exp. | Expeditionary. |
| F. C. M. | Field Court Martial. |
| F. O. C. | Field Officer’s Court. |
| G. C. M. | General Court Martial |
| G. O. | General Order. |
| Gen. Hdq | General Headquarters |
| H. I. | Hawaiian Islands. |
| Hdq. A. | Headquarters of the Army. |
| Hosp. | Hospital. |
| I. R. P. | Inspector of Rifle Practice. |
| Incl. | Inclusive. |
| Ind. | Independent. |
| Infy. | Infantry. |
| Lieut. | Lieutenant. |
| M. I. | Mustered In . |
| M. O. | Mustered out. |
| Maj. | Major. |
| Med. Chi | Medico Chirurgical |
| Mil. | Militia. |
| Mily. | Military. |
| Mus. | Musician. |
| N.G.P. | National Guard of Penna. |
| Non. Com. | Non Commissioned. |
| Ord. | Ordnance. |
| P. R. | Porto Rico. (sic) |
| P.I. | Philippine Islands. |
| P.V.I. | Penna. Vol. Infantry |
| Pac. | Pacific. |
| Par. | Paragraph. |
| Prin. Mus. | Principle Musician. |
| Priv. | Private. |
| Prom. | Promoted. |
| Q. M. Sgt. | Quartermaster Sergeant. |
| Q. M. | Quartermaster. |
| R. O. | Regimental Order. |
| Regt. | Regiment. |
| Regtl. | Regimental. |
| Res. | Residence |
| S. N. M. | State Naval Militia. |
| S. O. | Special order. |
| Sect. War. | Secretary of War. |
| Sgt. | Sergeant. |
| Slg. Corps. | Signal Corps. |
| Stew. | Steward. |
| Sub. | subsistence. |
| Sum. Ct. | Summary Court. |
| Surg. | Surgeon. |
| Tranfd. | Transferred. |
| U. S. Army | United States Army. |
| U. S. M. C. | United States Marine Corps. |
| U. S. Navy | United States Navy. |
| U. S. V. Eng. | United States Volunteer Engineers |
| V. O. | Verbal Order. |
| Vet. | Veteran. |
| Vety. | Veterinary. |
| Vol. | Volunteer. |
| W.Dept. | War Department. |
| Wag. | Wagoner. |
Source: Record of Pennsylvania Volunteers in the Spanish-American War, 1898, Thomas J. Stewart, Adjutant General, 1900.