Definition of "Combination" :

noun: the act of combining things to form a new whole

noun: the act of arranging elements into specified groups without regard to order

noun: a collection of things that have been combined; an assemblage of separate parts or qualities

noun: an alliance of people or corporations or countries for a special purpose (formerly to achieve some antisocial end but now for general political or economic purposes)

noun: a group of people (often temporary) having a common purpose

"They were a winning combination."

noun: a sequence of numbers or letters that opens a combination lock

"He forgot the combination to the safe."

noun: a coordinated sequence of chess moves