What it means
以来 means “since” or “from that time on.” It marks a starting point in the past and indicates that a state or action has continued from then until the relevant present or another reference time. It follows a noun referring to an event or time, or a verb in the て-form. The phrase often describes an ongoing result, habit, or situation, and it is more formal and written than everyday expressions such as から.
Usage note
以来 normally refers to a starting point that has a continuing connection to the later situation. Do not confuse it with 以来の, which modifies a noun, or with それ以来, which means “since then” and is used as a fixed expression.
How to use it
私は大学卒業以来、東京で働いています。
I have worked in Tokyo since graduating from university.
事故に遭って以来、彼は夜道を避けています。
Since he was involved in an accident, he has avoided nighttime streets.
私は大学卒業以来、東京で働いている。
I have worked in Tokyo since graduating from university.
事故に遭って以来、彼は夜道を避けている。
Since he was involved in an accident, he has avoided nighttime streets.
Example sentences
この町に引っ越して以来、毎朝近くの公園を走っている。
Since moving to this town, I have run in the nearby park every morning.
大学を卒業して以来、毎年同じ会社の研修に参加している。
Since graduating from university, I have participated in the same company's training every year.
昨年