Types of Pipes. Pipes come in several types and sizes. They can be divided into three main categories: metallic pipes, cement pipes and plastic pipes. Metallic pipes include steel pipes, galvanised iron pipes and cast iron pipes. Cement pipes include concrete cement pipes and asbestos cement pipes.
error of omissionnoun [ C ] uk â us â. âº a mistake that consists of not doing something you should have done, or not including something such as an amount or fact that should be included: Errors of omission are likely to be more common than errors of commission.
Definition of omission. 1  1a : something neglected or left undone There are a few omissions in the list.b : apathy toward or neglect of duty The police officer was reprimanded for the omission of his duty to inform the suspect of his rights. 2  2 : the act of omitting : the state of being omitted Her omission from the team was surprising.