1. castling - Noun
2. castling - Verb
4. Castling - Proper noun
of Castle
That which is cast or brought forth prematurely; an abortion.
A compound move of the king and castle. See Castle, v. i.
Source: Webster's dictionaryIn Castling, the King must be moved first, or before the Rook is quitted. If the Rook be quitted before the King is touched, the opposing player may demand that the move of the Rook shall stand without the Castling being completed. Howard Staunton
A correctly timed castling can often enhance this. Source: Internet
Castling is indicated by the special notations 0-0 for kingside castling and 0-0-0 for queenside castling. Source: Internet
Along with the king, the rook is involved during the king's castling move. Source: Internet
Except for any move of the knight and castling, pieces cannot jump over other pieces. Source: Internet
Finally the rules around castling were standardized – variations in the castling rules had persisted in Italy until the late 19th century. Source: Internet