What is 'Attestation'. The act of witnessing the signing of a document and then also signing it to verify that it was properly signed by those bound by its contents. BREAKING DOWN 'Attestation'. Broadly speaking, an attestation is a third party recognition of a documented agreement's validity.
Mechanical engineering is a diverse subject that derives its breadth from the need to design and manufacture everything from small individual parts and devices (e.g., microscale sensors and inkjet printer nozzles) to large systems (e.g., spacecraft and machine tools).
Designs, develops, and tests all aspects of mechanical components, equipment, and machinery. Applies knowledge of engineering principles to design products such as engines, instruments, controls, robots, machines, etc. May be involved in fabrication, operation, application, installation, and/or repair of mechanical products.