The word "hicieron" is the third-person plural form of the verb "hacer" in the preterite tense in Spanish. It translates to "they did" or "they made" in English. This verb is commonly used to describe completed actions in the past, such as activities or tasks that a group of people performed. In a sentence, "hicieron" can be used to refer to various subjects, such as los estudiantes (the students) or los amigos (the friends). For example, "Ellos hicieron la tarea" means "They did the homework." Understanding "hicieron" helps in forming sentences about past actions involving multiple subjects.