1. "Mercenaries" refers to individuals or groups hired to fight in a conflict, typically for monetary gain. They are often characterized by their lack of loyalty to any particular cause or nation and are solely motivated by financial incentives.2. The term "mercenaries" is plural, derived from the adjective "mercenary," which describes something done for payment rather than out of loyalty or moral obligation.3. For example, "Chadian mercenaries continue to arrive in Tripoli" indicates that soldiers from Chad, who are fighting for money, are steadily arriving in the Libyan city of Tripoli.4. Please feel free to ask if you have any doubts, and be sure to click the 'Mark as Satisfactory Answer' button if you are happy with the response.