Definition of write-ins:
(n) :
(politics) A candidate whose name is not listed on the ballot.
(n) :
(politics) A vote made for a candidate of this kind.
(n) :
A social event for authors, at which they meet up to work on their writing together.
(n) :
(crosswording, derogatory) A clue or puzzle that is so easy that the answer is immediately obvious.