* Adjective: Describing something as having twice the usual size or quantity.
* Example: "He ordered a double cheeseburger."
* Noun: Meaning two of something or a quantity twice as large.
* Example: "They played a double header."
* Verb: To make something twice as large or increase it by its own amount.
* Example: "The recipe instructed me to double the ingredients."
* Adverb: Meaning twice as much or twice as often.
* Example: "I checked the email double to make sure I didn't miss anything."
To determine the part of speech for "double" in a specific sentence, consider how it functions in the sentence.