Wordnet 3.0
ADJECTIVE (1)
1. 
 of or relating to a mayor or the office of mayor; 
- Example: "mayoral elections"
The Collaborative International Dictionary of English v.0.48:
Mayoral \May"or*al\, n. [Sp., fr. mayor greater, L. major.]
   The conductor of a mule team; also, a head shepherd.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
mayoral \may"or*al\, a.
   Of or pertaining to a mayor; as, the mayoral limousine.
   [PJC]
WordNet (r) 3.0 (2006):
mayoral
    adj 1: of or relating to a mayor or the office of mayor;
           "mayoral elections"