The difference between precedence and precedents

Precedence, Precedent

Precedent:

A precedent is an event,decision, or the like that will serve as an example or model in later cases.

• A judge's decision might be a precedent that other judges will take into account in similar trials in the future. 
• If a builder renews your contract, he shall be setting a precedent, and all other customers would expect a new contract too.
• Precedent can be an adjective as well as noun, though it is considered to be old fashioned.I guess you understand that my claim was precedent.
• Most celebrated derivative is unprecedented, meaning unheard of, original and unique.
• The government proposed unprecedented reforms for the upliftment of the downtrodden.

Precedence:

Precedence, unlike precedent, is an uncountable noun: you can speak of a precedent or five precedents, you usually cannot use a or five before precedence.

Precedence or precedent means 'going before' : both words share the Latin roots prae, 'before' + vedere, ' to go'. But, precedence suggests priority in importance rather than in time.

• Sooner or later, money takes precedence over love.