one's

See also: ones and -ones

English

From Middle English ones, equivalent to one +‎ -'s.

one's

Unlike most other possessive determiners (my, your etc., except for his and its), one’s has a word-final s, but unlike possessive pronouns (yours, hers, theirs), it is spelled with an apostrophe.

belonging to one

Belarusian: свой m (svoj)
Bulgarian: свой m (svoj)
Chinese:
Mandarin: 自己的 (zh) (zìjǐ de)
Czech: svůj (cs) m
Dutch: zijn (nl)
Esperanto: onia (eo)
Finnish: -nsa (fi), -nsä (fi), -an (fi), -än (fi)
French: son (fr) m, sa (fr) f, ses (fr) pl
Georgian: ვისიმე (visime), ვისამე (visame), ვინმესი (vinmesi)
German: sein (de) m, seine (de) f
Hindi: अपना (hi) (apnā)
Hungarian: -a (hu), -e (hu), -ja, -je
Italian: proprio (it), suo (it) (informal)
Japanese: 自分の (ja) (じぶんの, jibun no)
Korean: 자신의 (ko) (jasin-ui)
Macedonian: свој m (svoj)
Malayalam: ഒരാളുടെ (orāḷuṭe)
Polish: swój (pl) m
Portuguese: seu (pt), de alguém
Romanian: său (ro) m, sa f, săi m pl, sale (ro) f pl
Russian: свой (ru) m (svoj), своя́ (ru) f (svojá), своё (ru) n (svojó), свои́ (ru) pl (svoí)
Serbo-Croatian:
Cyrillic: свој m

Roman: svoj (sh) m
Slovak: svoj m
Slovene: svój
Spanish: su (es) m, suyo (es) m, suya (es) f, sus (es) m pl, suyos (es) m pl, suyas (es) f pl
Swedish: sin (sv) c, sitt (sv) n, sina (sv) pl, ens (sv)
Tamil: தன் (ta) (taṉ)
Ukrainian: свій (uk) m (svij), своя́ f (svojá), своє́ n (svojé), свої́ (uk) pl (svojí)
Urdu: اپنا (ur) (apnā)

Contraction of one is, equivalent to one + 's.

one's