Hebe

In my opinion and based on the definition of contract I have found, from the English perspective the only difference between a contract and an agreement is that a contract is always legally enforceable or binding. Whereas agreements reached verbally can be breached without legal consequences. Two people can agree to a join action but unless there is a legal instrument supporting and evidencing this agreement no legal actions can be taken in the event of a breach. In the example brought by margieben, it is obvious we can use the term contract or agreement, under the understanding that said agreement is legally biding.
I look forward to some feedbacks or comments on the contrary as one never stops leaning
Best regards
Definitions of contract in the web:

• sign: engage by written agreement; "They signed two new pitchers for the next season"
• A agreement that is legally binding, especially one that is written; A specific job or work order, often temporary or of fixed duration and usually governed by a written agreement; An agreement which the law will enforce in some way. ...
  en.wiktionary.org/wiki/contract
• a legally binding agreement between two or more parties.
  www.smallbiz.nsw.gov.au/smallbusiness/Resources/Business+Tools/Glossary+of+Business+Terms/
• An agreement between two or more people that is enforceable by law. Contracts may be written, oral or implied by a person's behavior.
  www.hyaline.com.au/Glossary/
• A legally enforceable agreement between two or more competent parties made either orally or in writing.
  courts.delaware.gov/How%20To/court%20proceedings/

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Truly, my dear young friends, you are a chosen generation. I hope you will never forget it.
Gordon B. Hinckley

PEO625

Hola a todos !!!
creo que la mejor opcion seria la que propusieron de "el presente acuerdo se celebra entre.." ya que el uso de dobletes o tripletes es muy frecuente en los textos legales en ingles pero el castellano tiende a suprimir y utilizar una sola preposicion...
espero les ayude!!

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Pao Onorato