Luck, Fortune
Adverb, Noun, and な adjective
さいわい
幸いなことに、ちょうど空車のタクシーがやって来ました。
Luckily, an empty taxi just came.
お役に立てたようで、幸いです。
I'm happy that I was able to help you.
幸い命に別状はありませんでした。
Fortunately, it was not life-threatening.
Happiness is happiness!
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You haven't learned this reading yet so here's a mnemonic to help you:
If your life is filled with nothing but happiness, every time someone says something to you, all you can do is say, "Sigh, what (さいわ)?" You sigh and say what. Because you're too happy to really listen. You're just sighing all day and not paying attention.