One of the mysteries of the English language finally explained.
1A refinement of thought or argument; a fine point; = "subtlety". Usually in plural.
2Refinement in argument or speculation; (excessive) use of fine distinctions.
3Cookery. = "subtlety". historical after 16th cent.
Now rare (chiefly superseded by subtlety)
Late Middle English (in an earlier sense). Partly an alteration of subtlety after subtile, and partly a variant of subtility with reduction of the final syllable.
In this article we explore how to impress employers with a spot-on CV.