Sec″ond‐a‐ry (?), n.; pl.Secondaries (�). 1. One who occupies a subordinate, inferior, or auxiliary place; a delegate or deputy; one who is second or next to the chief officer; as, the secondary, or undersheriff of the city of London.
Old Escalus... is thy secondary. Shak.
2. (Astron.) (a) A secondary circle. (b) A satellite.
3. (Zoöl.) A secondary quill.