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By oneself; without anyone else
彼は一人で旅行するのが好きです。
He likes to travel alone.
一人で食事をするのは寂しいです。
Eating alone is lonely.
Often used to express independence or solitude. Can have both positive (freedom) and negative (loneliness) connotations depending on context.
This phrase is very common in everyday Japanese. It's often used to describe activities done without companionship.
Remember that 'で' is the key particle here - it's what makes this a phrase rather than just a noun.
Combination of 一人 (hitori, 'one person') + で (de, particle indicating means/manner)
The particle 'で' here indicates the manner in which something is done. It's a common pattern for expressing 'by oneself'.