Mailbox / noun C [13] a folder used by an email server to store a user’s emails
Mains line / noun C [11] main electrlcity supply
Man / noun U [6] a Unix command for viewing the online manual pages on a Unix system
Markup language / noun C [14] a set of tags that can be inserted into a document to indicate its layout and appearance
Massively parallel / adj [24] being part of a system in which an application is processed by up to 200 or more processors at the same time. Each processor using its own operating systems and memory and working on a different part of the program.