Medium
(Built-in Mathematica Symbol) Medium is a style or option setting that specifies that objects should be medium sized.
MemberQ
(Built-in Mathematica Symbol) MemberQ[list, form] returns True if an element of list matches form, and False otherwise. MemberQ[list, form, levelspec] tests all parts of list specified by levelspec.
MenuCommandKey is an option for cells that specifies the keyboard shortcut to be associated with a style listed in the Format \[FilledRightTriangle] Style submenu.
MenuSortingValue is an option for cells and notebooks that specifies where a cell style, stylesheet, or palette is listed in the Format \[FilledRightTriangle] Style submenu, ...
MenuStyle is an option for menu-generating constructs that specifies the style to use in displaying menu items.
MenuView[{lbl_1 -> expr_1, lbl_2 -> expr_2, ...}] represents an object in which selecting the menu item with label lbl_i displays expr_i. MenuView[{lbl_1 -> expr_1, lbl_2 -> ...
MeshFunctions is an option for plotting functions that specifies functions to use to determine the placement of mesh divisions.
MeshShading is an option for plotting functions that gives lists of colors to use for regions between mesh divisions.
MeshStyle is an option for Plot3D, DensityPlot, and other plotting functions that specifies the style in which to draw a mesh.
MessageDialog[expr] puts up a standard message dialog that displays expr together with an OK button.MessageDialog[expr, {lbl_1 :> act_1, lbl_2 :> act_2, ...}] includes ...