Appointment of Space - the term used to discuss the various spacings that occur between letters, words, lines, colums, and in margins (headers, footers) etc.

Letterspacing, wordspacing- the spatial interval between two letters or words

Kerning - closing the space between letters

Tracking - Kerning on a larger scale

Em space - a space between letters (words) the width of the "m" in that font --also em-dash

En Space - same, but width of "n" or 1/2 of the "m" --also en-dash

Units = divisions of "em", used to measure the space between letters, for every font there is a table of spacing between letters

Points = points measure type, leading height (letter width, line length, image area, margins) conversion chart

Picas = measures line length conversion chart

Line measure - length of line in a column copy

Leading - space between lines (measured in points)

Line space - notated as <point size/point size + leading space> (ie. 12/14 = 12 pt. type with 2 pts. leading)

Alignment - a "paragraph" setting --flush left (unjustified, or ragged) and justified most legible; flush right, centered OK for short text or lists; force justified watch out for wordspacing issues, you may have to manipulate the width of your column for best results

Margins - the unprinted space surrounding type matter on a page

River - In text type, a series of interword spaces that accidentally align vertically or diagonally, creating an objectionable flow of white space within the column

White space - the 'negative' area surrounding a letterform