In grammar:
* Auxiliary verb: This is the most common use of the word. Auxiliary verbs, also called helping verbs, are used in conjunction with main verbs to create verb phrases. They help express things like tense, mood, voice, and emphasis. Examples include: *be*, *have*, *do*, *will*, *can*, *should*.
Examples:
* I *am* going to the store. (Auxiliary verb *am* helps form the future tense)
* She *has* finished her homework. (Auxiliary verb *has* helps form the present perfect tense)
* They *should* be here by now. (Auxiliary verb *should* expresses a modal, suggesting something is likely or desirable)
In other contexts:
* Auxiliary equipment: This refers to equipment that supports or assists the main equipment. For example, a car jack is auxiliary equipment for changing a tire.
* Auxiliary power: This refers to a backup power source, like a generator, that provides power in case of a power outage.
* Auxiliary staff: These are staff members who provide support or assistance to a main team or department. For example, administrative assistants, customer service representatives, or technicians might be considered auxiliary staff.
* Auxiliary language: A language learned in addition to one's native language.
To figure out the specific meaning of "auxiliary" in a sentence, consider the surrounding context and the words it is associated with.