fortalecerán
Fortalecerán is the third-person plural future indicative form of the Spanish verb "fortalecer." This verb translates to "to strengthen" or "to fortify" in English. Therefore, "fortalecerán" means "they will strengthen" or "they will fortify." The word is used to describe an action that will be carried out by a group of subjects in the future. For instance, it could be used in a sentence such as "Las nuevas políticas fortalecerán la economía" which translates to "The new policies will strengthen the economy." Similarly, "Los atletas fortalecerán sus músculos con entrenamiento intensivo" means "The athletes will strengthen their muscles with intensive training." The context in which "fortalecerán" appears will determine the specific nuance of strengthening or fortifying being conveyed.