以内に
解説 Definition
以内に、範囲の中でという意味です。時間や距離、限度を表す語の前に置き、その範囲を超えないことを示します。
Within means before a stated period ends or at a distance that does not exceed a stated limit. It can also indicate that something remains inside a particular boundary, range, or set of restrictions.
覚え方のコツ Memory Tip
with（〜と共に）と形が似ていますが、within は「境界の内側」が核です。within an hour なら1時間という限度を越えず、within five minutes of the house なら家から5分の範囲内。時間・距離・規則などの「枠」を思い浮かべ、反対の beyond や outside と対比して覚えます。
Picture a clear boundary and keep the action on its inner side. In within an hour, the hour is a deadline that must not be crossed; in within five minutes of my house, five minutes marks the maximum distance. This boundary can represent time, distance, rules, or other limits. Contrast within with beyond or outside: within stays inside the permitted range, while beyond crosses it. Common patterns such as within two days, within walking distance, and within the rules reinforce this single spatial idea.
例文
Please come back within an hour.
1時間以内に戻ってきてください。
The school is within five minutes of my house.
その学校は私の家から5分以内の場所にあります。
Finish this work within two days.
この仕事を2日以内に終えてください。
within の類義語・関連語
within の語源・成り立ち Etymology
古英語 wiðinnan で、wið（～に対して）と innan（内部に）の合成語。inne（中）はゲルマン祖語 *in に由来し、ラテン語 in と同根。関連語に inner（内側の）、within 自体が without（～なしに）と対をなす。「内側の範囲に」という空間感覚から時間・数量の「以内に」へ拡張した。
Within comes from Old English withinnan, formed from elements meaning roughly “against or toward” and “inside.” Its earliest uses expressed location on the inner side of a boundary. That spatial sense later extended naturally to nonphysical limits, including periods of time, distances, quantities, and rules. The element related to “inside” also belongs to the Germanic word family represented in modern English by in and inner.
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