yoni : [f.] origin; realm of existence; the female organ; knowledge; species.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Yoni (f.) [Vedic yoni] 1. the womb. -- 2. origin, way of birth, place of birth, realm of existence; nature, matrix. There are four yonis or ways of being born or generation, viz. aṇḍaja oviparous creation, jalābuja viviparous, saŋsedaja moisture -- sprung, opapātika spontaneous: M i.73; D iii.230; Miln 146; Vism 552, 557 sq.; cp. VbhA 203 sq. -- Freq. in foll. combns: tiracchāna˚ the class of animals, the brute creation A i.37, 60; v.269; It 92; Pv iv.111; Vism 103, 427; PvA 27, 166; nāga˚ birth among the Nāgas S iii.240 sq. (in ref. to which the 4 kinds of birth, as mentioned above, are also applied); Vism 102 (niraya -- nāga -- yoni); pasu˚=tiracchāna˚ Pv ii.1312; pisāca˚ world of the Pisācas S i.209; peta˚ the realm of the Petas PvA 68 (cp. peta). -- kamma˚ K. as origin A iii.186. -- yoni upaparikkhitabba (=kiŋjātikā etc.) S iii.42. -- ayoniunclean origin Th 1, 219. -- 3. thoroughness, knowledge, insight Nett 40. -- ayoni superficiality in thought S i.203 ("muddled ways" Mrs. Rh. D.). -- yoniso(abl.) "down to its origin or foundation," i. e. thoroughly, orderly, wisely, properly, judiciously S i.203 ("in ordered governance" K.S. i.259); D i.118 (wisely); It 30 (āraddha āsavānaŋ khayāya); Pug 25; Vism 30, 132, 599; PpA 31. Opp. ayoniso disorderly improperly Pug 21; DhA i.327; PvA 113, 278. -- Esp. frequent in phrase yoniso manasikāra "fixing one's attention with a purpose or thoroughly," proper attention, "having thorough method in one's thought" (K.S. i.259) Ps i.85 sq.; It 9; J i.116; Miln 32; Nett 8, 40, 50, 127; Vism 132; PvA 63. See also manasikāra. -- Opp. ayoniso manasikāra disorderly or distracted attention D iii.273; VbhA 148; ThA 79. In BSk. the same phrase: yoniśo manasikāraḥ Divy 488; AvŚ i.122; ii.112 (Speyer: "the right & true insight, as the object of consideration really is"). See further on term Dial. iii.218 ("systematized attention"); K.S. i.131; ii.6 ("radical grasp").
   -- ja born from the womb Sn 620; Dh 396. -- pamukha principal sort of birth D i.54; M i.517.

Pali-English Dictionary, TW Rhys Davids, William Stede,

yoni (i.e. VS. xxiii, 2) KātyŚr

Sanskrit-English Dictionary, by M. Monier William

Mode of birth,

Sarvastivada Abhidharma, Sanskrit-English Glossary, by Bhikkhu KL Dhammajoti