सद्

From Proto-Indo-European *sed-. Cognates include Latin sedeō, Old Church Slavonic сѣдѣти (sěděti), Old English sittan (whence English sit).

• (Vedic) IPA^(key): /sɐd/
• (Classical Sanskrit) IPA^(key): /s̪ɐd̪/

सद् • (sad)

1. to sit down
   • c. 1700 BCE – 1200 BCE, Ṛgveda 8.29.2:

     योनि॒मेक॒ आ स॑साद॒ द्योत॑नो॒ऽन्तर्दे॒वेषु॒ मेधि॑रः॥

     yóniméka ā́ sasāda dyótanoʼntárdevéṣu médhiraḥ.

     One (Agni) intelligent, resplendent among the gods, is seated in his place (the altar).

2. to sink down, despair, perish

सद् • (sád) stem

1. sitting or dwelling in

• उपनिषद् (upaniṣád)

• Monier Williams (1899) “सद्”, in A Sanskrit–English Dictionary, , new edition, Oxford: At the Clarendon Press, →OCLC, page 1138, column 2.
• William Dwight Whitney, 1885, The Roots, Verb-forms, and Primary Derivatives of the Sanskrit Language, Leipzig: Breitkopf and Härtel, page 183
• Mayrhofer, Manfred (1996) Etymologisches Wörterbuch des Altindoarischen [Etymological Dictionary of Old Indo-Aryan]‎ (in German), volume 2, Heidelberg: Carl Winter Universitätsverlag, pages 692-3
• Hellwig, Oliver (2010-2024) “sad”, in DCS - The Digital Corpus of Sanskrit, Berlin, Germany.