Codex:M

Magistrate
A magistrate is a judicial officer who has limited authority to administer and enforce the law. He have less power then a governor. Small towns like Nassau and Isla Tesoro were normally ruled by magistrates.

Mainmast
The second mast from forward on any two-mast ship; the larger forward mast on vessels such as ketches; the sole mast on vessels such as sloops or cutters. 

Mandola
A fretted, stringed musical instrument. Scrum was known to be a great player of the mandola.

Manual labor
"A bit of manual labor is good for you, former commodore. It builds character."

- Jack Sparrow to James Norrington

Any work done by hand; usually implying it is unskilled or physically demanding. During his time aboard the Black Pearl, former commodore James Norrington was forced to work aboard.

Map
"I shall have a look at that map, if it's what I fear..."

- Jack Sparrow

A visual representation of an area or territory, whether real or imaginary; a diagram of components of an item. Maps were used to search for various treasures as well as certain places.

Maroon
"When you marooned me on that godforsaken spit of land, you forgot one very important thing, mate. I'm Captain Jack Sparrow."

- Jack Sparrow to Hector Barbossa

To put ashore and abandon on a desolate island by way of punishment. Jack Sparrow was twice marooned on Rumrunner's Isle by Hector Barbossa. Sparrow later marooned the cursed crew on the same island.

Marriage
"You know... Lizzie. I am captain of a ship. And being captain of a ship, I could in fact perform a marriage right here, right on this deck...right now."

- Jack Sparrow to Elizabeth Swann

The union of two people, to the exclusion of all others, voluntarily entered into for life. A joining of two parts during a wedding.

Mast
"Dearly beloved we be gathered here today...to nail your gizzards to the mast, you poxy cur!"

- Hector Barbossa before he kicks one of Davy Jones's crewmembers A spar or structure rising above a ship's hull to hold sails, spars, rigging, booms etc. Ships commonly carry a foremast or mainmast. 

Master-at-arms
A crewmen who's responsible for the ship's weaponry and fighting condition.

Mate
"You don't want to be doing that, mate." "No, I really think I do."

- Jack Sparrow and Hector Barbossa

Term commonly given to any officer or sailor below the captain of a ship. Also used to refer to the First Mate. 

Matelot
Matelot is a French word meaning "seamen". In pirate slang Matelot referred to a pirate who was in a union known as "matelotage" with another pirate; they shared all their possessions (even the wives) and if one of them died, the other succeeded him.

Matey
"Ah. Feast your eyes upon this, mateys. There's more than one way to live forever. Gents, I give you the Fountain of Youth."

- Hector Barbossa to his crew

Matey [mey-tee] - n.: A pirate's buddy or friend. Best used after "Ahoy" or "Arrr".

Mermaid
"Aye. Mermaids. Sea ghouls, devil fish, dreadful in hunger for flesh of man. Mermaid waters, that be our path."

- Hector Barbossa

Mermaids were human-fish hybrids in mythology and lore. They are best known to lurk in the depths of the sea, most notably in Isla Sirena and Whitecap Bay.

Missionary
"A missionary is the story. What I heard, was he got captured in a raid. The rest on the ship got killed, but not him. First Mate wouldn't let it happen, on account his premier standing with the Lord."

- Scrum to Jack Sparrow concerning Philip Swift

A person who travels attempting to spread a religion or a creed; a religious messenger. Philip Swift was a well-known missionary.

Monopoly
"Were I in a divulgatory mood, what then might I divulge?" "Everything. Where are they meeting? Who are the Pirate Lords? What is the purpose of the nine pieces of eight?" "I think I'd prefer to maintain my monopoly on those answers. Just good business, you know."

- Jack Sparrow and Cutler Beckett The privilege granting the exclusive right to exert such control.

Mum
"Did your friend happen to mention where the Brethren Court are meeting?" "He was mum on that, sir."

- Cutler Beckett and Ian Mercer

Silent; not saying a word (to keep mum); it was used commonly in the idiom "mum's the word". 

Mum's the word
"Lock up the Code! Strike the wenches! And if any of ye ever speak a word of this...I'll have your tongue." "...Aye, sir. Mum's the word." [squawking] "Mum's the word."

- Mungard, Cotton and Cotton's parrot

An idiom meaning that the accompanying facts are a secret, not to be divulged.

Musket
A musket is a muzzle-loaded firearm that fires a round lead bullet through a long smoothbore barrel. Because of the smoothbore barrels, these weapons had an accurate range of roughly fifty yards, when fired by a practiced musketeer. Because of their accuracy, soldiers would often form lines and fire at once in volleys to maximize efftcts. These weapons were widely used by the Royal Marines of the Royal Navy, soldiers of almost every European Army, as well as by Pirates. A person using a musket is called a musketeer. It is a weapon often used by Jack Sparrow's teen friend, Arabella Smith.

Mutiny
"Aye, the perfidious rotter led a mutiny against us!"

- Joshamee Gibbs

Mutiny [myoot-n-ee] - noun: Rebellion against authority. This is best known as sailors' revolt against the captain or officers of a ship. A participant of a mutiny were called a Mutineer.

Muttonhead
"Parley? Damn to the depths whatever muttonhead thought up 'parley'!" "That would be the French."

- Pintel and Jack Sparrow

A dull or stupid person; often used as a general term of abuse. A fool or bonehead.