ABBREVIATIONS USED IN THESE VOLUMES
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| M | |
| m. = | mile or miles. |
| Maj. = | Major. |
| Maj.-Gen. = | Major-General. |
| M.B.E. = | Member of the Order of the British Empire. |
| M.C. = | Military Cross (British); Master of Chemistry. |
| Md. = | Maryland. |
| Mdi. = | Middlesex. |
| Me. = | Maine. |
| Mebu. = | Maschinengewehr-Eisenbeton-unterstand = Reinforced concrete machine-gun emplacement (German). |
| M.E.F. = | Mediterranean Expeditionary Force (British 1915–7) |
| Mesop. = | Mesopotamia. |
| M.G. = | Machine-gun (heavy implied, as a rube). |
| M.G.A. = | Major-General in charge of administration, regional commands (British). |
| M.G.C. = | Machine-gun Corps. |
| M.G.G.S. = | Major-General, General Staff of an Army (British). |
| M.g.H. = | Mit geschränkter Haftung = With limited liability (German). |
| M.G.K. = | Maschinengewehr-Kompanie = Machine-gun Company (German). |
| M.G.O. = | Master-General of the Ordnance (British). |
| MJ. = | Military Intelligence; formerly also Mounted Infantry (British). |
| Mich. = | Michigan. |
| Minn. = | Minnesota. |
| Miss. = | Mississippi. |
| M.L. = | Muzzle-loading. |
| M.M. = | Military Medal (British). |
| M. of M. = | Ministry of Munitions (British). |
| Mo. = | Missouri. |
| Mons. = | Monmouthshire. |
| Mont. = | Montana. |
| M.S. = | Military Secretary. |
| M.T. = | Mechanical Transport. |
| m.V. = | mit Verzögerung = Delay-action fuze (German). |
| MW. = | Minenwerfer = Trench Mortar (German). |
| N | |
| N. = | North. |
| N.A.C.B. = | Navy and Army Canteen Board (British). |
| N.Af. = | North Africa. |
| N.Am. = | North America. |
| N.C. = | North Carolina. |
| N.C.T. = | Nitro-cellulose, Tubular. |
| ND. = | North Dakota. |
| Neb. = | Nebraska. |
| Nev. = | Nevada. |
| N.H. = | New Hampshire. |
| N.H.P. = | Nominal Horse-power. |
| N.I.D. = | Naval Intelligence Division (British). |
| N.J. = | New Jersey. |
| N.M. = | New Mexico. |
| Nor. = | Norway. |
| Norf. = | Norfolk. |
| Northants. = | Northamptonshire. |
| Northumb. = | Northumberland. |
| N.O.T. = | Netherlands Overseas Trust. |
| Notts. = | Nottinghamshire. |
| N.S. = | Gregorian, or new style, Calendar (see 4.994). |
| N.U.R. = | National Union of Railwaymen (British). |
| N.U.S.E.C. = | National Union of Societies for Equal Citizenship (British). |
| N.U.W.S.S. = | National Union of Women's Suffrage Societies (British). |
| N.U.W.W. = | National Union of Women Workers (British). |
| N.Y. = | New York. |
| O | |
| O. = | Ohio. |
| O.B.E. = | Officer of the Order of the British Empire. |
| O.C. = | Officer Commanding (British). |
| O.H.L. = | Oberste Heeresleitung = Supreme Army Command (German). |
| Okla. = | Oklahoma. |
| Ore. = | Oregon. |
| O.S. = | Ordnance Survey (British); Julian, or old style. Calendar (see 4.994). |
| O.T.C. = | Officers' Training Corps. |
| o.V. = | ohne Verzögerung = Direct-action fuze (German). |
| Oxon. = | Oxfordshire. |
| oz. = | ounce or ounces. |
| P | |
| P. = | Percussion (fuze). |
| Pa. = | Pennsylvania. |
| P.A. = | Pour ampliation = Authorized for issue of documents (French Army). |
| P.C. = | Poste de Commandement (French Army); Post of Command (U.S.A.) = battle or advanced headquarters (British). |
| P. et Cv. = | Parcs et Comois = Trains and columns (French Army). |
| P.O. = | Par ordre = By order; by command (French); Post Office. |
| PoL = | Poland. |
| pop. = | population. |
| P.R. = | Poste-retard = Delay-action fuze (French). |
| Pr. = | Pounder (Gun designation). |
| Pres. = | President. |
| Prof. = | Professor. |
| pt. = | pint or pints. |
| P.V. = | Pigeon voyageur = Carrier-pigeon (French). |
| Q | |
| Q.A.L.M.N.S. | Queen Alexandra's Imperial Military Nursing Service (British). |
| Q.A.M.F.N.S. | Queen Alexandra's Military Families Nursing Service (British). |
| Q.A.R.N.N.S. | Queen Alexandra's Royal Naval Nursing Service (British). |
| Q.F. = | Quickfiring (artillery). |
| Q.G. = | Quartier Général = Headquarters (French). |
| Q.G.A2 = | Headquarters of the II. Army (French). |
| Q.M.A.A.C. = | Queen Mary's Army Auxiliary Corps (W.A.A.C.) (British). |
| Q.M.G. = | Quartermaster-General. |
| Q.M.N.G. = | Queen Mary's Needlework Guild (British). |
| qr. = | quarter or quarters, |
| qt. = | quart or quarts. |
| q.v. = | quod vide = which see (Latin), for reference. |
| R | |
| R. = | Reserve (in troop designations). |
| R.A. = | Royal Artillery (British). |
| R.A.C. = | Royal Automobile Club (British). |
| R.A.F. = | Royal Air Force (British). |
| R.A.M.C. = | Royal Army Medical Corps (British). |
| R.A.O.C. = | Royal Army Ordnance Corps (British). |
| R.A.S.C. = | Royal Army Service Corps (British). |
| R.C.S. = | Royal Corps of Signals, since 1919 (British). |
| R.D. = | Rive Droite = Right bank (of a river) (French). |
| R.E. = | Royal Engineers (British). |
| Regt. = | Regiment. |
| Res. = | Reserve. |
| R.F.A. = | Royal Field Artillery (British). |
| R.F.C. = | Royal Flying Corps (British). |
| R.G. = | Rive Gauche = Left bank (of a river) (French). |
| R.G.A. = | Royal Garrison Artillery (British). |
| R.H.A. = | Royal Horse Artillery (British). |
| R.I. = | Rhode Island. |
| R.I.B.A. = | Royal Institute of British Architects. |
| R.I.C. = | Royal Irish Constabulary. |
| R.M. = | Royal Marines (British). |
| R.M.A. = | Royal Military Academy (Woohwich); Royal Marine Artillery (British). |
| R.M.C. = | Royal Military College (England). |
| R.M.L.I. = | Royal Marine Light Infantry (British). |
| R.N. = | Royal Navy (British). |
| R.N.A.F. = | Royal Naval Air Force (British). |
| R.N.A.S. = | Royal Naval Air Service (British). |
| R.N.R. = | Royal Naval Reserve (British). |
| R.N.V.R. = | Royal Naval Volunteer Reserve (British). |
| ro. = | roods. |
| rs. = | rupees. |
| R.O.D. = | Railway Operating Division (British Army in France). |
| R.P. = | Rules of Procedure (British Military Law). |
| R.T.O. = | Railway Transport Officer (British and U.S.A.). |
| Rutl. = | Rutland. |
| R.W. = | Royal Warrant (for pay, etc.) (British). |
| S | |
| S. = | South. |
| s. = | shilling or shillings. |
| S.A.E. = | Society of Automobile Engineers. |
| Salop = | Shropshire. |
| S.C. = | South Carolina. |
| S.D. = | South Dakota. |
| seq. = | sequens, sequentia = the following (Latin). |
| Sil. = | Silesia. |
| S.M.O. = | Senior Medical Officer of a formation or station (British). |
| S.M.T.O. = | Senior Mechanical Transport Officer of a formation (British). |
| Som. = | Somersetshire. |
| S.O.S. = | Services of Supply, Rear Zone (U.S.A.), equivalent to British L. of C; also wireless call for life-saving. |
| S.P.R. = | Society for Psychical Research. |
| S.P.V.D. = | Society for Prevention of Venereal Disease. |
| Sq. = | Squadron. |
| sq.ft. = | square feet. |
| S.R. = | Sans retard = Direct-action (of fuze). |
