peace,
According to my studies:
"deen" means that which is due, hence its meanings of obligation, indebtedness, requital, system
From:
http://www.studyquran.co.uk/PRLonline.htm= Dal-Ya-Nun = obedience/submissiveness, servility, religion, high/elevated/noble/glorious rank/condition/state, took/receive a loan or borrowed upon credit, become indebted, in debt, under the obligation of a debt, contract a debt, repay/reimburse a loan, rule/govern/manage it, possess/own it, become habituated/accustomed to something, confirmation, death (because it is a debt everyone must pay), a particular law/statute, system, custom/habit/business, a way/course/manner of conduct/acting, repayment/compensation.
Daynun (n.): Debt; lending.
Tadaayantum (prf. 2nd. p. m. plu. VI.): You transact.
La Yadiinuuna (imp. 3rd. p. m. plu.): They do not subscribe, do not observe (religious laws).
Diin: Requital; judgement; faith; law; obedience.
Madyiinuun/ Madyiiniin: Requitted.
dana vb. (I)
impf. act. 9:29
pcple. pass. 37:53, 56:86
dayn n.m. 2:282, 4:11, 4:12, 4:12, 4:12
din n.m. 1:4, 2:132, 2:193, 2:217, 2:217, 2:256, 3:19, 3:24, 3:73, 3:83, 3:85, 4:46, 4:125, 4:146, 4:171, 5:3, 5:3, 5:3, 5:54, 5:57, 5:77, 6:70, 6:137, 6:159, 6:161, 7:29, 7:51, 8:39, 8:49, 8:72, 9:11, 9:12, 9:29, 9:33, 9:33, 9:36, 9:122, 10:22, 10:104, 10:105, 12:40, 12:76, 15:35, 16:52, 22:78, 24:2, 24:25, 24:55, 26:82, 29:65, 30:30, 30:30, 30:32, 30:43, 31:32, 33:5, 37:20, 38:78, 39:2, 39:3, 39:11, 39:14, 40:14, 40:26, 40:65, 42:13, 42:13, 42:21, 48:28, 48:28, 49:16, 51:6, 51:12, 56:56, 60:8, 60:9, 61:9, 61:9, 70:26, 74:46, 82:9, 82:15, 82:17, 82:18, 83:11, 95:7, 98:5, 98:5, 107:1, 109:6, 109:6, 110:2,
tadayana vb. (VI) perf. act. 2:282
Lane's Lexicon, Volume 3, pages: 108, 109, 110, 111, 112 ##
http://ejtaal.net/aa/#q=dyn