Plegometer : plego METER (ple gomâ e ter) n. An instrument for measuring and recording the force of blows 13. Speedometer : speedo METER (spe domâ et er) n.
Best Answer: A certified letter is sent by a person or a business when they want to mail important information and be sure that it was received. It's not usually a good thing. Collection agencies send them, people involved in legal cases send them, etc... If you won a sweepstakes you would get them.
Certified is cheaper than a registered letter, which travels outside the regular mail flow, it is signed for and individually handled at every stop in the process. It therefore takes more time to be delivered and is more expensive.