Often, redundancies occur in speech unintentionally, but redundant phrases can also be deliberately constructed for emphasis, to reduce the chance that a phrase will be misinterpreted. In rhetoric, the term "redundancy" tends to have a negative connotation and may be perceived as improper because of its use of duplicative or unnecessary wording (and some people expand the definition to include self-contradictory wording, similar to double negation); however, it remains a linguistically valid way of placing emphasis on some expressed idea. Through the use of repetition of certain concepts, redundancy increases the odds of predictability of a message's meaning and understanding to others.