Primarily means chiefly, and before anything else. Primarily concerned with, primarily a writer, used primarily for storage.
It ranks rather than excludes: something primarily for one purpose is also used for others, which is exactly why the word is useful in careful writing. It is stressed on the first syllable in Britain and often on the second in America.
1adverbprimarilyChiefly, and before anything else.
“The course is aimed primarily at beginners, though anyone can join.”
primarily is a degree.
Latin
prīmārius — of the first (rank); chief, principal; excellent
English
primary
English, today
primarily
From primary + -ly. primary Latin prīmārius (“of the first (rank); chief, principal; excellent”), from prīmus (first; whence the English - adjective prime) + -ārius (whence the English - suffix -ary); compare the French primaire, primer, and premier. a doublet of premier.
Etymology from Wiktionary, CC BY-SA