From; by: a cause, motive; to allow, let; translit. yo, yu; e. g. 由乾; 由乾陀羅 由乾陁羅, Yugamdhara, idem 踰健達羅.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous

由 [py] yóu [wg] yu [ko] 유 yu [ja] ユ yu ||| (1) Through, using, by means of. (2) As, still, even. (3) From; an indication of the ablative case. To depend upon; to come from; according to. (4) That which, whereby. (5) For that reason, therefore. (6) Since. (7) Reason, cause, ground, basis; depending on... means, instrument, source, motive. (8) To follow, permit, allow. (9) At ease; self-possessed. (10) Relationship.

[Dictionary References] Naka1385d [Credit] cmuller(entry) cwittern(py)

–tas, yasmāt, vaśena, upādāya, niśritya; adhikāreṇa, adhiṣṭhāya, anurūpa, artham, avalambin, -ena (inst.), kila, gata,tathā hi, tena, nimitta, pratītya, prasaṅgena, mūla, yad, yogāt, vaśatas, vaśāṭ, sāmānyāt, hetu, hetoḥ.

佛教漢梵大辭典

P.2360-P.2361.

由===分別緣起初勝法門經十二頁云：既命終已，導引近生，令得生起；是其由義。
 
二解　瑜伽八卷十二頁云：於未來世，可愛樂故；名可愛語 。

二解　如如來功德六相中說。

朱芾煌《法相辭典》字庫