1. the physical dimensions, proportions, or extent of something
2. a particular measurement or standard used for clothing, shoes, or other items
3. the relative extent or degree of something

1. to estimate or determine the dimensions or extent of something
2. to make something a particular size

Examples

• The size of the room was perfect for our meeting.
• What size shoes do you wear?
• The company has grown dramatically in size over the past decade.
• We need to size up the competition before launching our product.
• The architect will size the windows to fit the building’s proportions.
• She couldn’t believe the size of the crowd at the concert.
• This shirt comes in sizes small through extra large.