]]> to demand payment; an expense or a cost. to gather together from several sources. one who purchases a commodity or service. a reduction in price; to reduce in price. acting or producing effectively with a minimum of waste or unnecessary effort. to approximate the amount or value of something; to form an opinion about something; an approximation. to establish or apply as compulsory; to force upon others. an error or a fault. a request made to purchase something; to command or direct. on time, punctually. to set right or correct. conditions.