ABBREVIATIONS USED IN THESE VOLUMES
| A | |
| A.A. = | Anti-Aircraft; Army Act (British); Automobile Association. |
| A.A.G. = | Assistant Adjutant General |
| A.B.C. = | Argentina, Brazil, Chile. |
| Abt. = | Abteilung = Detachment, sub-unit (German Army). |
| ac. = | acre or acres |
| A.C. = | Artillerie de Campagne, Artillerie de Corps = Field artillery, Corps artillery—followed by numeral (French). |
| A.C.I. = | Army Council Instruction (British). |
| A.C. of S. = | Assistant Chief-of-Staff (U.S.A.). |
| A.D. = | Anno Domini = In the year of our Lord (Latin); Artillerie divisionnaire = Divisional artillery (followed by numeral) (French). |
| Adml. = | Admiral. |
| A.E.F. = | American Expeditionary Force. |
| A.F. = | Air Force (British). |
| A.F.C. = | Air Force Cross (British). |
| A.F.E.F. = | Anglo-French Expeditionary Force. |
| A.F.M. = | Air Force Medal (British). |
| A.F. of L. = | American Federation of Labour. |
| A.G. = | Adjutant-General. |
| A.I.D. = | Aircraft Inspection Department (British). |
| A.I.F. = | Australian Imperial Force. |
| A.L. = | Artillerie Lourde = Heavy artillery (French). |
| Ala. = | Alabama. |
| A.L.A.M. = | Association of Licensed Automobile Manufacturers. |
| A.L.G.P. = | Artillerie Lourde à grande puissance = Super-heavy artillery (French). |
| Als.-Lor. = | Alsace-Lorraine. |
| A.L.V.F. = | Artillerie Lourde à voie ferrée = Heavy railway artillery (French). |
| A.M.S. = | Army Medical Service. |
| ANZAC. = | Australian and New Zealand Army Corps. |
| A.O.C. = | Army Ordnance Corps (since 1918 R.A.O.C.) |
| A.O.K. = | Armee-Oberkommando = Supreme Army Command (Austro-Hungarian); Headquarters of an army, with numeral, e.g. A.O.K. 2 (German). |
| A.P.C. = | Army Pay Corps; since 1918 R.A.P.C. (British). |
| A.P.D. = | Army Pay Department (British). |
| Ariz. = | Arizona. |
| Ark. = | Arkansas. |
| A.S.C. = | Army Service Corps; since 1918 R.A.S.C. (British). |
| A.S.E. = | Amalgamated Society of Engineers. |
| A.T. = | Artillerie de tranchée = Trench artillery (French). |
| A.V.C. = | Army Veterinary Corps; since 1918 R.A.V.C. (British). |
| A.V.S. = | Army Veterinary Service. |
| Az. | Aufschlagzünder = Percussion fuze (German). |
| B | |
| b. = | born. |
| Balk. Penin. | Balkan Peninsula. |
| bar. = | barrel or barrels. |
| Batt. = | Battery; battalion. |
| Bav. = | Bavarian |
| B.C. = | Before Christ. |
| Bde. = | Brigade. |
| Beds. = | Bedfordshire. |
| B.E.F. = | British Expeditionary Force (in particular in France and Belgium). |
| Berks. = | Berkshire. |
| B.G. = | Brigadier-General, General Staff appointment (British). |
| B.H.P. = | Brake Horse-power. |
| B.L. = | Breech-loading (artillery; as distinct from Q.F.). |
| B.M. = | Brigade-Major (British). |
| B.M.A. = | British Medical Association. |
| Bn. = | Battalion. |
| Brig.-Gen. = | Brigadier-General. |
| Bucks. = | Buckinghamshire. |
| bus. = | bushel or bushels. |
| Bz. = | Brennzünder = Time fuze (German). |
| C | |
| c. = | circa = round about (Latin). |
| C.A. = | Corps d'Armée = Army Corps (French). |
| C.A.C. = | Corps d'Armée Coloniale = Colonial Army Corps (French). |
| Cal. = | California. |
| Cambs. = | Cambridgeshire. |
| Capt. = | Captain. |
| C.Asia = | Central Asia. |
| Cav. = | Cavalry. |
| C.B.E. = | Commander of the Order of the British Empire. |
| C.C. = | Corps de Cavalerie = Cavalry Corps (French). |
| CE. = | Contre-Espionnage = Anti-spy service (French). |
| C.E. = | Tetronitromethylaniline (Tetryl) (Chemical Explosive). |
| C.F. = | Chaplain to the Forces (British). |
| cf. = | confer = compare (Latin). |
| C.G.S. = | Chief of the General Staff (British). |
| C.H. = | Companian of Honour. |
| Ches. = | Cheshire. |
| C.G.T. = | Confédération Générale du Travail = General Federation of Labour (French). |
| C.-in-C. = | Commander-in-Chief (British). |
| C.I.D. = | Criminal Investigation Department (British). |
| C.I.G.S. = | Chief of the Imperial General Staff (British). |
| C.M. = | Court-martial. |
| C.M.B. = | Central Midwives Board. |
| C.N. = | Comité Nationale de Secours et d'Alimentation = National Committee for Relief and Feeding (Belgium). |
| co. = | county. |
| Co. = | Company. |
| C.O. = | Commanding Officer (British). |
| C. of S. | Chief of Staff (U.S.A.). |
| Col. = | Colonel. |
| Colo. = | Colorado. |
| Comm. = | Commander. |
| Conn. = | Connecticut. |
| Corn. = | Cornwall. |
| C.O.S. = | Charity Organization Society (British). |
| C.P. = | Centre-pivot (artillery). |
| C.R.A. = | Commanding Royal Artillery, i.e. commanding a formation or station (British). |
| C.R.A. | Commission régulatrice automobile = Motor regulation staff (French). |
| C.R.B. = | Commission for Relief in Belgium. |
| C.R.E. = | Commanding Royal Engineers, i.e. commanding a formation (British). |
C.r.h.  C.r.o.  = |
Calibres-radius of head or ogive (artillery). |
| cub. ft. = | cubic feet. |
| Cumb. = | Cumberland. |
| C.W.S. = | Coöperative Wholesale Society. |
| cwt. = | hundredweight. |
| D | |
| d. = | died; also penny or pence. |
| D. = | Director (e.g. D.M.O. = Director of Military Operations); as prefix of office-abbreviations = Deputy- (e.g. D.D.M.I. = Deputy Director of Miltacy Intelligence). |
| D.A. = | Détachement d'Armée = Army group (French); Direct Action (fuze); Direction de l’Arrière = Directorate of the Rear Zone (French). Equivalent to British L. of C. and American S.O.S. |
| D.A.Q.M.G. = | Deputy Assistant Quartermaster-General. |
| D.B.E. = | Dame of the Order of the British Empire. |
| D.C. = | Division de Cavalerie = Cavalry Division (French); District of Columbia. |
| D.C.A. = | Défenses Contre Avions (or Aéronefs) = Anti-Aircraft Defence (French). |
