आप्

From Proto-Indo-European *h₁ep- (“to take, seize”); compare perhaps Hittite 𒂊𒅁𒍣 (e-ep-zi /⁠ʔéptsi⁠/, “seizes”), 𒉺𒀀𒄿 (pa-a-i /⁠pāi⁠/, “gives, hands over, pays”), as well as Latin apīscor (“I try to seize”) and co-epī (“I have started, undertaken”).

• (Vedic) IPA^(key): /ɑːp/
• (Classical) IPA^(key): /ɑːp/

आप् • (āp)

1. to reach, meet, overtake
2. to obtain, take possession
3. to undergo, suffer
4. to enter, pervade

• Monier Williams (1899) “आप्”, in A Sanskrit–English Dictionary, […], new edition, Oxford: At the Clarendon Press, →OCLC, page 0142.
• William Dwight Whitney, 1885, The Roots, Verb-forms, and Primary Derivatives of the Sanskrit Language, Leipzig: Breitkopf and Härtel, page 0+
• Otto Böhtlingk, Richard Schmidt (1879-1928) “आप्”, in Walter Slaje, Jürgen Hanneder, Paul Molitor, Jörg Ritter, editors, Nachtragswörterbuch des Sanskrit [Dictionary of Sanskrit with supplements] (in German), Halle-Wittenberg: Martin-Luther-Universität, published 2016
• Mayrhofer, Manfred (1992) Etymologisches Wörterbuch des Altindoarischen [Etymological Dictionary of Old Indo-Aryan]‎ (in German), volume 1, Heidelberg: Carl Winter Universitätsverlag, page 167
• Mallory, J. P. with Adams, D. Q. (2006) The Oxford Introduction to Proto-Indo-European and the Proto-Indo-European World (Oxford Linguistics), New York: Oxford University Press, →ISBN, page 270