An Etymological Dictionary of Astronomy and Astrophysics

(Especially of laws or other established rules, usages, etc.) to make void or null; abolish; cancel; invalidate (Dictionary.com).

Etymology (EN): M.E., from O.Fr. anuller, from L.L. annullare “to make to nothing,” from L. → ad- “to” + nullum, neuter of nullus “nothing,” → null.

Etymology (PE): Ânulidan, from prefix â- + nul, → null,

• -idan infinitive suffix.