noun
    
    plural -tions
    
    the act or process of adopting someone or something: such as
    
    the act or process of adopting a child [noncount]
    
    
    
    
    
    
    
    
    
    
    
    [noncount] :the act or process of beginning to use something new or different
    
    
    
    
    
    [noncount] :the act or process of giving official acceptance or approval to something