片方|かたほうkatahou[3]nakadaka (mid-high)

1. nounone side; one party; the other side; the other party
2. no-adjectiveone (of a pair); the other (one); the mate; the fellow
   この靴下くつしたの片方かたほうはどこだ。↗

   Where is the mate to this sock?

• SynonymサイドNeutralLoanword for a side of something or one party's position, as in 「会社サイド」; 「片方」 is for one of a pair.
• Antonym両方りょうほうNeutralMeans both of two, the direct opposite of 「片方」, which is just one of them.
• Antonym双方そうほうWrittenWritten/formal word for the two parties involved, as in 「双方の意見」「双方合意」; unlike 「片方」, it covers both, and the parties need not be opposed.

Use 「片方」 for one of a pair, as in 「靴下の片方」. For both of two use 「両方」; for the two parties involved, in formal prose, use 「双方」; 「サイド」 is for a side or one party's position.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. （かたほう）二ふたつある物ものの内うちの一ひとつ。かたかた。