Dictionary Definition:
Pure (indecl.) [is the genuine representative (with Mā- gadhī e) of Vedic puraḥ, which also appears as *puro in purohita, as *pura in purakkharoti. It belongs to base Idg. *per (cp. pari), as in Cr. pa/ros before, earlier, pre/sbus "preceding in life," i. e. older; Ohg. first] before (both local & temporal), thus either "before, in front" or "before, formerly, earlier." In both meanings the opp. is pacchā -- (a) local S i.176 (pure hoti to lead); J ii.153 (opp. pacchima) -- (b)temporal S i.200; Sn 289, 311, 541, 645, 773 (=atītaŋ Nd1 33; opp. pacchā); Dh 348 (opp. pacchato); J i.50 (with abl. pure puṇṇamāya). Often meaning "in a former life," e. g. Vv 348, 3413; Pv i.21 (=pubbe atītajātiyaŋ PvA 10); ii.32 (cp. purima); ii.42; ii.74 (=atītabhāve PvA 101); ii.913. -- apure apacchāneither before nor after, i. e. simultaneously PugA 186 (see apubbaŋ): -- puretaraŋ (adv.) first, ahead, before any one else DhA i.13, 40. -- (c) modal,meaning "lest" DA i.4; cp. purā in same sense Jtm. 28.
-- cārika going before, guiding, leading, only in phrase ˚n katvā putting before everything else, taking as a guide or ideal J i.176 (mettā -- bhāvanaŋ); iii.45 (id.), 180 (khantiñ ca mettañ ca); vi.127 (Indaŋ); PugA 194 (paññaŋ). -- java [cp. BSk. purojava attendant Divy 211, 214, 379; also Vedic puroyāva preceding] preceding, preceded by, controlled by (=pubbangama) S i.33 (sammādiṭṭhi˚); Sn 1107 (dhamma -- takka˚, cp. Nd2 318). -- jāta happening before, as logical category (˚paccaya) "antecedence"; Vism 537 (elevenfold)= Tikp. 17; freq. in Dukp. & Tikp. (as ārammaṇa˚ & vatthu˚), cp. VbhA 403 (˚ārammaṇa & ˚vatthuka). -- dvāra front door J ii.153. -- bhatta the early meal, morning meal, breakfast [cp. BSk. purobhaktakā Divy 307] VvA 120; PvA 109; ˚ŋ in the morning VvA 51; PvA 78; ˚kicca duties after the morning meal DA i.45 sq.; SnA 131 sq. -- bhava "being in front," i. e. superior DA i.75 (in exegesis of porī). -- samaṇa one who wanders ahead of someone else Vin ii.32 (opp. pacchā˚).