noun, adverb
all alone; by oneself; on one's own
Emphasizes being completely alone, with no one else present. Often used adverbially with で or as a noun with の. Similar to 一人っきり, but 一人きり is slightly more common.
See also: 一人っきり
彼は一人きりで旅に出た。
He set off on a journey all by himself.
一人きりの時間が好きだ。
I like time alone.
Almost identical in meaning; 一人っきり has a geminated っ, which can sound slightly more emphatic or colloquial. Both are interchangeable in most contexts.
Means 'one person' or 'alone', but without the strong emphasis on being completely alone that きり adds. 一人きり stresses the absence of others more strongly.
Compound of 一人 (ひとり, 'one person') and きり, a suffix meaning 'only' or 'just', derived from the verb 切る (きる, 'to cut'), implying a limit or boundary. The combination emphasizes being limited to just one person.