Alone
noun
The kanji and the word are exactly the same. That means they share meanings as well.
The reading is different from the one you learned (this is kun'yomi). There's an easy way to remember it, though. 一人 and 独り share the same readings and mean almost the same thing. Just try to remember that this ひとり is used to emphasize solitude and independence.
彼は独り住居だ。
He lives alone.