The word "solely" means "only" or "exclusively." It is used to indicate that something is done for one specific reason or purpose, without involving anything else. When you say that something is carried out solely for a certain reason, you emphasize that there are no other considerations or factors involved.
The word "solely" comes from the late Middle English word "sole," which means "alone" or "single." It is derived from the Latin word "solus," which also means "alone." The suffix "-ly" transforms the adjective into an adverb, indicating the manner in which something is done.