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