Dictionary Definition:
Amacca [Vedic amātya (only in meaning "companion"), adj. formation fr. amā an adverbial loc. -- gen. of pron. 1st person, Sk. ahaŋ = Idg. *emo (cp. Sk. m -- ama), meaning "(those) of me or with me", i. e. those who are in my house] 1. friend, companion, fellow -- worker, helper, esp. one who gives his advice, a bosom -- friend It 73; J vi. 512 (sahajātā amaccā); Pv ii.620 (a ˚ -- paricārikā well-advising friends as company or around him). Freq. in combn. with mitta as mittɔ âmaccā, friends & colleagues D iii.189 -- 90; S 190 = A ii.67; PvA 29; or with ñātī (ñāti -- sālohitā intimate friends & near -- relations), mittâmaccā ñātisālohitā Vin ii.126; Sn p. 104 (= mittā ca kammakarā ca SnA 447); mittā vā amaccā vā ñātī vā sālohitā vā A i.222; PvA 28; amaccā ñāti -- sanghā ca A i.152. <-> 2. Especially a king's intimate friend, king's favourite, confidant J i.262; PvA 73 (˚kula), 74 (amaccā ca purohito ca), 81 (sabba -- kammika amacca), 93; and his special adviser or privy councillor, as such distinguished from the official ministers (purohita, mahāmatta, pārisajja); usually combd. with pārisajjā (pl.) viz. D i.136 (= piya -- sahāyaka DA i.297, but cp. the foll. expln. of pārisajjā as "sesā āṇatti -- karā"); Vin i.348; D iii.64 (amaccā pārisajjā gaṇakamahāmattā); A i.142 (catunnaŋ mahārājānaŋ a. pārisajjā). See on the question of ministers in general Fick, Sociale Gliederung p. 93, 164 & Banerjea, Public Administration in Ancient India pp. 106 -- 120.