Older Brother, Big Brother, Elder Brother
noun
The kanji and the word are exactly the same. That means they share meanings as well. This implies that it is your older brother, by the way. Not somebody else's.
あに
Since this word is made up of a single kanji, it should use the kun'yomi reading. You haven't learned this reading yet, so here's a mnemonic to help you: Your older brother is different from everyone else's. He has odd powers... some would say powers of the force. Do you know what his name is? It's Ani (あに), short for Anikin... wait a sec, does that sound familiar?
兄が二人います。
I have two older brothers.
兄はプロジェクトマネジャーです。
My brother is a project manager.
兄の車でアトランタまで行きました。
I drove my brother's car to Atlanta.