PRI: Personal Record Identifier (Canada) PRI: Periodic Reinvestigation: PRI: Preliminary Rifle Instruction: PRI: Planning, Review, and Inspection: PRI: Progressive Routing Indicator (US DoD) PRI: Prisoner Reentry Initiative (various locations) PRI: Policy Research Institute (various locations)
Adding definition, to unite or join so as to increase the number, quantity, size, or importance: to add two cups of sugar; to add a postscript to her letter; to add insult to injury. See more. Dictionary.com
Summary. 1. An amendment means changes made in an already existing agreement. On the other hand, an addendum means including an additional document in the already existing one. 2. While an addendum becomes a part of the legal and binding contract, amendments are only part of a contract until negotiations. 3. An amendment can also be called as correcting a document, improving the document, making alteration or including supplementary information to the first document.