Is your friend the tall woman in the purple dress?
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you:
Say (せ) your height right now. Say it. SAY IT. Imagine I'm getting all in your face, saying "say it" at you.