data  n. facts or information used in deciding or discussing sth
    
        debate  n. formal argument or discussion of a question, eg at a public meeting or in Parliament, with two or more opposing speakers, and often ending in a vote
    
        decade  n. period of ten years
    
        decline  v.  say `no' to (sth); refuse (sth offered), usu politely
    
        deduce  v. ~ sth arrive at (facts, a theory, etc) by reasoning; infer sth
    
        define  v.  ~ sth state precisely the meaning of (eg words)
    
        definite  adj. clear; not doubtful
    
        demonstrate  v.  ~ sth (to sb) show sth clearly by giving proof or evidence
    
        denote  v. be the name, sign or symbol of (sth); refer to
    
        deny  v.  say that (sth) is not true
    
        depress  v.  make sad and without enthusiasm