以 / by means of

Kanji for by means of, because, or in view of.

Readings

Type	Reading	Notes
On (音)	イ	Sino-Japanese readings — common in compounds.
Kun (訓)	もっ.て	Native Japanese readings — common standalone or with okurigana.

以 carries the meaning by means of, because, or in view of.

以下いかnot exceeding ... / not more than ... / ... and under

以降いこうon and after / from ... onward / since

以後いごafter this / from now on / hereafter

以上いじょうnot less than ... / ... and over / ... and above

以前いぜんbefore / prior to / ago