* Adjective: Describing something as typical, usual, or normal.
* "This is the standard procedure for handling customer complaints."
* Noun: A level of quality or achievement.
* "We strive to maintain a high standard in all our products."
* "The standard of living has improved dramatically in recent years."
* Noun: A specific thing that is considered the norm.
* "The company uses the standard model for its new vehicles."
* Verb: To set a level of quality or achievement.
* "The government standardized the national curriculum."
Therefore, "standard" can function as an adjective, noun, or verb, depending on its role in the sentence.