1. the way in which something is used or the act of using something
2. the customary or accepted way of using words in a language
Usage: linguistics
3. the amount of something that is used

Examples

• The usage of cell phones in class is prohibited.
• Proper usage of this equipment requires training.
• The dictionary explains correct English usage.
• Modern usage has changed the meaning of that word.
• Our water usage increased during the summer months.
• The software tracks your data usage automatically.
• Standard usage requires a comma in that sentence.