machine
Don’t use as a synonym for computer.
macOS
Operating system used on Apple Macintosh computers. Use lowercase for mac and uppercase for OS.
See also OS, operating system.
manipulate
Don’t use. Instead, use work with, handle, or use.
MariaDB
Capitalize M and use uppercase for DB.
Markdown
Capitalize.
Don’t use a filename extension to refer to a type of file. For example, use Markdown file rather than .md file.
For more information, see Referring to file types.
marquee
OK to use when referring to the scrolling text feature or tag.
markup, mark up
One word as a noun. As a verb, use two words as in mark up. Don’t hyphenate in any form.
master, master/slave
Avoid using whenever possible. Instead, replace master with a contextually relevant term such as primary, main, original, parent, initiator, driver, controller, manager, mixer, aggregator, publisher, leader, or active. Use primary/secondary, primary/subordinate, principal/agent or other relevant terms instead of master/slave.
For more information, see Replacing established terms.
mathematical
Use instead of mathematic.
matrix, matrices
Use the plural matrixes unless there is a domain-specific reason (for example, a mathematical context) to use matrices.
may
Avoid using in standard documentation; reserve may for official policy or legal considerations. To convey possibility, use might instead. To convey permission, use can instead.
See also can
maximize
Use to refer to making a window as big as possible without going full screen.
See also minimize.
MB, megabyte
Initialism for megabyte. Use uppercase.
One MB equals 10002 bytes in the context of file size or storage capacity, and 10242 bytes in the context of computer memory.
In the noun form, insert a space between the numeral and the abbreviation. Use the preposition of before the unit.
Example
Recommended: 128 MB of storage
Don’t hyphenate the adjective form.
Example
For more information about spelling out abbreviations, see Abbreviations.
Mbit, megabit
Initialism for megabit.
One Mbit equals 10002 bits in the context of file size or storage capacity, and 10242 bits in the context of computer memory.
In the noun form, insert a space between the numeral and the abbreviation. Use the preposition of before the unit.
Example
Don’t hyphenate the adjective form.
Example
For more information about spelling out abbreviations, see Abbreviations.
Mbps (Mbit/s), megabits per second
Initialism for megabits per second.
For more information, see Units of measurement.
For more information about spelling out abbreviations, see Abbreviations.
See also Mbit, megabit.
MBps (MB/s), megabytes per second
Initialism for megabytes per second.
For more information, see Units of measurement.
For more information about spelling out abbreviations, see Abbreviations.
See also MB, megabyte.
media, medium
Use medium as a singular subject and media as a plural subject. Accordingly, use the correct verb form; the medium is and the media are.
However, when discussing audio, video, and images, you can use media as a singular subject to describe a collection of content such as a set of images.
mega-
In general, don’t hyphenate words beginning with mega- such as megabit, megabyte, megahertz, and megapixel, unless mega- is followed by a proper noun or it is absolutely necessary to avoid confusion.
For more information, see Hyphens.
For word usage of specific terms, see The American Heritage Dictionary.
memory
In most cases, refer to a specific kind of memory, such as random-access memory (RAM), read-only memory (ROM), virtual memory, or portable storage devices.
In the noun forms that refer to memory measurements, use of in a prepositional phrase before the unit, such as 512 MB of RAM.
Don’t use memory to refer to storage capacity; instead, use a term such as storage space.
See also storage.
menu bar
In general, emphasize on the task to be accomplished, rather than how the user should interact with the UI element.
For more information, see Menu bar.
menu item
In general, emphasize on the task to be accomplished, rather than how the user should interact with the UI element.
OK to use in developer documentation and for a technical audience. Avoid using in user documentation and for a general audience.
For more information, see UI elements.
message
Don’t use as a verb. Instead, use send, receive, or a contextually relevant term.
OK to use as a noun. If required, you can also provide adjective to present further context, such as text message, email message, audio message or video message.
meta
For the Make WordPress Meta Team, capitalize Meta.
In general, don’t hyphenate words beginning with meta- such as metadata, and metafeed, unless meta- is followed by a proper noun or it is absolutely necessary to avoid confusion.
For more information, see Hyphens.
metadata
One word. Not meta data or meta-data.
method
In the context developer documentation or for a technical audience, where method refers to a member of a class, avoid also using method as a synonym for manner or approach.
MHz, megahertz
Initialism for megahertz.
In the noun form, insert a space between the numeral and the abbreviation. Use the preposition of before the unit.
Example
Don’t hyphenate the adjective form.
Example
For more information about spelling out abbreviations, see Abbreviations.
micro-
In general, don’t hyphenate words beginning with micro- such as microprocessor, microservices, and microcomputer unless micro- is followed by a proper noun or it is absolutely necessary to avoid confusion.
For more information, see Hyphens.
For word usage of specific terms, see The American Heritage Dictionary.
Microsoft
OK to use. Capitalize.
See also Windows.
midnight
OK to use, but not when paired with time in the numeral format.
Example
For more information, see Dates and times.
migrate
Use to move databases, media, users, applications or code, from one server, environment or platform to another. Don’t use as a synonym for upgrade or port.
million, M
Don’t abbreviate million as M, m, or mn. Spell out the word or denote the entire number.
For more information, see Abbreviations in numbers.
MIME
Abbreviation for Multipurpose Internet Mail Extension. Use uppercase.
For more information about spelling out abbreviations, see Abbreviations.
minimize
Use to refer to placing the window in the taskbar or dock.
See also maximize.
ML
Abbreviation for machine learning. Use uppercase.
For more information about spelling out abbreviations, see Abbreviations.
mobile, mobile device, mobile phone
Use instead of cell phone.
See also phone.
mobile data
Use instead of cellular data.
mobile network
Use instead of cellular network.
monospace
One word. Not mono space or mono-space.
more than
Use to describe items or elements that are quantifiable such as amounts or figures.
Don’t use over.
mount
Use as a verb to describe the action of making a disk or disk image available.
OK to use in developer documentation and for a technical audience. Avoid using in user documentation and for a general audience.
See also unmount.
mouse
Avoid referring to the mouse whenever possible. Instead, emphasize on the task to be accomplished, and the interaction verb with the mouse such as select, click, or press.
For more information, see Interaction verbs.
mouse over
Don’t use as a synonym for move the mouse pointer to.
For more information, see Interaction verbs.
movable
Not moveable.
move
Use as a verb to describe transferring files, folders, or UI elements from one location to another.
For more information, see Interaction verbs.
MP3
Initialism for MPEG Audio Layer 3. Use uppercase.
Don’t use a filename extension to refer to a type of file. For example, use MP3 file rather than .mp3 file.
For more information, see Referring to file types.
MP4
Initialism for MPEG-4. Use uppercase.
Don’t use a filename extension to refer to a type of file. For example, use MP4 file rather than .mp4 file.
For more information, see Referring to file types.
See also MPEG.
MPEG
Acronym for Moving Picture Experts Group. Use uppercase.
Don’t use a filename extension to refer to a type of file. For example, use MPEG file rather than .mpg file.
For more information, see Referring to file types.
multi-
In general, don’t hyphenate words beginning with multi- such as multimedia, multilevel, multisite, and multiuser, unless multi- is followed by a proper noun or it is absolutely necessary to avoid confusion.
For more information, see Hyphens.
For word usage of specific terms, see The American Heritage Dictionary.
multisite
One word. Not multi site or multi-site.
multitask, multitasking
Don’t use multitask as a verb. OK to use multitasking as a noun or an adjective.
must
Use to refer to a task that a user is required to do. Don’t use must to indicate suggestions or a condescending tone.
For example, You should set a strong password is a suggestion, whereas You must set a strong password is a requirement.
For more information, see Style, voice, and tone.
See also should.
MySQL
Capitalize M and use uppercase for SQL.