以内

• Pinyin: yǐ nèi
• Hanzi breakdown: 以 = pictograph suggesting use or means; 内 = 冂 (enclosure radical) + 人 (person), meaning inside or interior

Meaning

Within; inside (a specified limit or range). Used to indicate that something falls within a particular boundary, time frame, or quantity.

Always follows a quantity or noun indicating the upper limit: 一周以内 (within one week), 一公里以内 (within one kilometre), 预算以内 (within budget). Often appears in formal and official contexts. Contrasts with 以外 (outside of/beyond) and 以上/以下 (above/below).

Examples

1. 请在三天以内把报告发给我。 Please send the report to me within three days.
2. 学校规定，学生必须在晚上十点以内回到宿舍。 The school rules require students to return to the dormitory by ten o'clock in the evening.
3. 公司承诺，所有订单将在一周以内发货。 The company promises that all orders will be dispatched within one week.

Usage Guide

Context: everyday, official, business

Tone: neutral

Do Say

• 请在规定时间以内完成任务。(Please complete the task within the specified time.)
• 两公里以内有好几家餐厅可以选择。(Within two kilometres there are several restaurants to choose from.)

Don't Say

• 在'以内'后面再加'里面'或'之内' (Don't say 一周以内里面 or 一周以内之内 — 以内 already means 'within', so adding 里面 or 之内 is redundant)

Origin & History

A compound of 以 (within; by means of) and 内 (inside; interior). Together they express being within a boundary or upper limit.

Cultural Context

Generation: All ages

Social background: Universal