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.
You can send Certified Mail to a P.O. Box in the United States. USPS Certified Mail letters are addressed and delivered to the PO Box with no changes in mailers process. In other words you just address the letter using the PO Box instead of the street delivery address.