complement
    /ˈkɑːmpləmənt/ 
    
 
    
    noun
    
    plural -ments
    
    [count] something that completes something else or makes it better
    
    
    
    the usual number or quantity of something that is needed or used
    
    
    
    
    
    
    
    grammar :a word or group of words added to a sentence to make it complete
    
    
    
    verb
    
    -ments; -mented; -menting
    
    [+ obj] :to complete something else or make it better