A space between the letters of a word, specifically (in printing, telegraphy, etc.) an interval or blank inserted between individual characters of type.
Origin
Mid 19th century. From letter + space.
Definition of letter space in US English:
letter space
nounˈlɛtə speɪs
A space between the letters of a word, specifically (in printing, telegraphy, etc.) an interval or blank inserted between individual characters of type.