- "Obsolete" means "has been replaced".
- "Depreciated" means "has less value than its original value".
- "Deprecated" means to expressly disprove of and was popularised due to misspellings in two technical articles where the authors used deprecated without an "i". One in 1999 and the other in 2002 referenced in the dictionaries as origins.
Prior to that time frame we were reading comments like // depreciated in API documentation including the MS MSDN.
The use of deprecated in the tech industry is therefore completely incorrect and evidence of how a technical writer can produce a bug that can live in a language and someone should finally put the bug to rest.
