GNU Collaborative International Dictionary of English

Found one definition

1.       
   Honeymoon (?), n.
   1. The first month after marriage.  Addison.
   
   [1913 Webster]
   
   
   2. A vacation taken together by a newly married couple, usually including a trip away from home.
   
   [PJC]
   
   
   3. Hence: [fig.] Any initial period of harmony after two or more people or organizations begin working together; as, “the usual honeymoon for a newly elected president was cut short by resumption of partisan sniping over the budget”.
   
   [PJC]