Combination (noun)

1. The action or process of combining things to form a whole.
2. A sequence of numbers or letters used to open a combination lock.
3. A group of people or things that have been combined for a particular purpose.

Origin:

Late middle english: from old french combinacion, or from latin combinatio(n-), from com- "together" + bini "two by two" + -atio(n).

Examples:

1. The combination of the two companies.
2. I forgot the combination to my locker.
3. A combination of herbs and spices.
4. The winning combination of hard work and talent.
5. A combination of public transport and cycling.