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molecule 1 today a single atom or several atoms bound together electromagnetically, forming the smallest particle that possesses all the characteristic physical and chemical properties of an element or compound. [2 definitions] Main Adv.
contract 1 today an agreement, usu. legally binding, entered into by two or more parties that specifies what each party will do or not do. [8 definitions] Main Adv.
puzzle 1 today a toy or enjoyable problem that requires thought, and sometimes manipulation of something, for a solution. [4 definitions] Main Adv.
repress 1 today to restrain or prevent the expression of (feelings, utterances, or the like). [3 definitions] Main Adv.
contact 1 today the touching of two things or people. [3 definitions] Kids Ch.