An Etymological Dictionary of Astronomy and Astrophysics

1. To continue steadfastly or firmly in some state, purpose, course of action, or the like, especially in spite of opposition, remonstrance, etc.
   

2. To last or endure tenaciously (Dictionary.com).

Etymology (EN): M.Fr. persister, from L. persistere “abide, continue steadfastly,” from → per- “thoroughly” + sistere “come to stand, cause to stand still,” → resist.

Etymology (PE): Paristâdan from par-, → per-,

• istâdan “to stand,” → resist.