someone; a certain person
Refers to an unspecified or unnamed person, often used when the speaker does not know or does not wish to specify who. Common in both spoken and written Japanese.
Someone told me that.
ある人にとっては簡単なことでも、他の人には難しい。
What is easy for one person may be difficult for another.
Rarely used kanji form; 或る is an uncommon spelling for ある.
Combination of the prenominal adnominal ある (a certain) and 人 (person).