one's own discretion; one's own idea; one's own responsibility
Used when a decision or action is based on one's own judgment, often in formal or business settings. Common in phrases like 一存では決められない (cannot decide on one's own).
I cannot decide on my own, so I will consult my boss.
That matter was proceeded with at his own discretion.
Compound of 一 (one) and 存 (think, consider). The exact historical derivation is uncertain, but it likely developed as a term for one's own thinking or judgment.