List of established military terms
Flèche: an arrow shaped outwork, smaller than a ravelin or a lunette, with 2 faces with a parapet and an open gorge
Fort
Fortification
Fortress
Gabion: a large basket filled with earth, used to form a temporary parapet for artillery
Glacis: a bank of earth sloping away from the fort, to protect it from direct artillery fire
Gorge: opening at the rear of an outwork for access by defending troops from the main defensive position
Hill fort (New Zealand: Pa (Māori))
Lunette: an outwork consisting of a salient angle with two flanks and an open gorge.
Magazine: a protected place within a fort, where ammunition is stored and prepared for use.
Mining: a siege method used since antiquity against a walled city, fortress or castle, where tunnels are dug to undermine the foundations of the walls; also see counter-mine.
Outwork: a minor defence, built or established outside the principal fortification limits, detached or semidetached.
Parapet: a wall at the edge of the rampart to protect the defenders.
Pillbox: a small concrete guard post.
Polygonal fort: a later type of fort without bastions.
Rampart: The main defensive wall of a fortification.
Ravelin: a triangular fortification in front of bastion as a detached outwork.
Redan: a V-shaped salient angle toward an expected attack, made from earthworks or other material.
Redoubt: a fort or fort system usually consisting of an enclosed defensive emplacement outside a larger fort, which can be constructed of earthworks, stone or brick.
Reduit: an enclosed defensive emplacement inside a larger fort; provides protection during a persistent attack.
Sangar: a small temporary fortified position with a breastwork originally of stone, but built of sandbags and similar materials in modern times.
Sally port
Sapping
Scarp: the side of a ditch in front of a fortification facing away from it.
Sconce: a small protective fortification, such as an earthwork, often placed on a mound as a defensive work for artillery.
Sea fort: a coastal fort entirely surrounded by the sea, either built on a rock or directly onto the sea bed.
Slighting: the deliberate destruction of an (abandoned) fortification without opposition from its (former) occupants and/or defenders.
Sortie
Star fort: a star-shaped fortress surrounding a town or city (also known as Bastion fortress or Trace italienne).
Team room: 
Tenaille (archaic Tenalia): an advanced pincer-shaped defensive work in front of the main defences of a fortress.
Terreplein: the fighting platform on top of a rampart, behind the parapet.
Tête-de-pont: a temporary defensive work defending a bridge at the end closest to the enemy.
Trace italienne: a star-shaped fortress surrounding a town or city (also known as Bastion fortress or star fort).
Trench

Geographic: Defile: a geographic term for a narrow pass or gorge between mountains. It has its origins as a military description of a pass through which troops can march only in a narrow column or with a narrow front.
Debouch:
To emerge from a defile or similar into open country;
A fortification at the end of a defile;
Water that flows out of a defile into a wider place such as a lake.

Naval: 

Arms and services: These terms concern combat arms and supporting services of armed forces used in naval warfare.

Strike package

Doctrinal: These terms concern the type of use of naval armed forces.

Blockade
Coup de grâce: a final shot intended to finish off a sinking (enemy) ship (which should be distinguished from scuttling).
Crossing the Tee
Conn
Vanguard—the leading part of an advancing military formation
Line astern, line ahead, or line of battle
Over-the-beach capability
Raking fire
Scuttling
Weather gage

Operational: Adrift: Loose and out of control. Typically applied to a ship or vessel that has lost power and is unable to control its movement.
Aft: Any part of the ship closer to the stern than you currently are.
All Hands: The entire ship's crew to include all officers and enlisted.
Aye, Aye: Response acknowledging and understanding a command.
Bow: Front of the ship.
Below: Any deck beneath the one you are currently on.
Burner, Burner Go: Afterburner on full power
Carry on: An order given to continue work or duties.
Cast off: To throw off, to let go, to unfurl.
Colours: Raising and lowering of the National Ensign, the National flag, and organization flags.
Fathom: Unit of measurement generally used for depth from sea level to sea floor.
General Quarters: Battle stations. Generally set when the ship is about to engage in battle or hostile activities.
Jettison: To throw or dispose of something over the side of the ship.
Ladder: Also known as a ladder well. Much like civilian stairs, however much steeper.
Leave: Vacation time nearly completely free unless an emergency recall occurs.
Shore leave or Liberty (US): Permission to leave the ship/base to enjoy non-work activities.
Mid-watch: Tends to be the midnight to 0400 watch. Also known as "balls to four" due to military time equivalent 0000-0400.
Needle alive: Airspeed indicator showing increasing speed.
Port Side: Left hand side of the ship.
Quarters: Generally the morning assembly of all hands for muster and accountability.
Starboard: Right hand side of the ship.
Ready 5/Alert 5: Aircraft on standby on flight deck ready to be launched in 5 minutes or less.
Ready room: Room on an aircraft carrier where aircrew conduct much of their pre-flight and post-flight briefs.
Round Down: The stern of the Carrier where the Flight Deck Started.
Smoke in the air: Used by Naval Aviators/Aircrew for locked-on incoming missiles at visual range.
Sea skimming: Low level flight procedure for missiles/fighter aircraft to avoid radar detection.
Stern: Rear of the ship.
Taps: Lights out, time to sleep.
Turn to: Start working.
Working Aloft: Working above the highest deck, generally performing maintenance on the ship's mast or antennas.

Ordnance: Naval artillery
Sea mine
Powerhead
Speargun
Supercavitating ammunition
Supercavitating torpedo
Torpedo
Turret
Underwater firearm

Vessels: Aircraft carrier
Helicopter carrier
Escort carrier
Fleet carrier
Light carrier
Fighter catapult ship
Catapult aircraft merchant ship
Merchant aircraft carrier
Aircraft maintenance carrier
Interdiction assault ship
Flagship
Special service ship
Troopship
Ship's tender
Attack transport
Battlecarrier
Battleship
Dreadnought
Pocket battleship
Seaplane tender
Sloop
Battlecruiser
Cruiser
Heavy cruiser
Armored cruiser
Light cruiser
Scout cruiser
Strike cruiser
Destroyer
Destroyer escort
Destroyer flotilla leader
Destroyer depot ship
Frigate
Corvette
Aerodynamically alleviated marine vehicle
Ground-effect vehicle
Hovercraft
Landing Craft Air Cushion
Landing craft depot ship
Merchant cruiser
Stealth ship
Surface effect ship
Submarine
Submarine tender
Midget submarine
Cruiser submarine
Hunter-killer submarine
Ballistic missile submarine
Guided missile submarine
Submarine chaser
Submarine aircraft carrier
Torpedo boat
Amphibious command ship
Amphibious assault ship
Amphibious transport dock
Dock landing ship
Expeditionary transfer dock
Littoral combat ship
Coastal defence ship
Barracks ship
Mexeflote
Rhino ferry
Patrol boat
Research vessel
Survey ship
Dry dock
Torpedo trials craft
Guard ship
Cable layer
Cable repair ship
Cargo ship
Attack cargo ship
Vehicle cargo ship
Dry cargo ship
Replenishment oiler
Oil tanker
Maritime prepositioning ship
Offshore supply ship
Container ship
Hospital ship
Fast combat support ship
Expeditionary fast transport
Salvage ship
Instrumentation ship
Fleet ocean tug
Riverine command ship
Special operations insertion ship
High-speed transport
Maritime security cutter
Medium endurance cutter
High endurance cutter
Fast response cutter
Marine protector
Landing ship
Tank landing ship
Icebreaker
Heavy icebreaker
Inland construction tender
Seagoing buoy tender
Coastal buoy tender
Logistic support ship
Arsenal ship
Floating battery
Training ship
Minelayer
Mine countermeasures vessel
Minesweeper
Gunboat
Riverine gunboat
Dock landing ship
Monitor
Breastwork monitor
Riverine monitor
Technical research ship
Self defense test ship
Self-propelled radar station
Fast sea frame
Crane ship
Aviation logistics support ship
Moored training ship
Naval trawler

Engineering: Air cavity system
Electrohydrodynamics
Internal drive propulsion
Magnetohydrodynamic drive
Pump-jet
Supercavitation
Supercavitating propeller

Air: 

Arms and services: These terms concern combat arms and supporting services of armed forces used in air warfare.

Flight (military unit)

Operational: Airspeed alive: Airspeed indicator showing increasing speed.