As a deity name
Name 362 of the Narasimha Sahasranāma — Brahmanda Purana / Narasimha Purana, as taught by Sages to Assembly of Devotees
Name 68 of the Vishnu Sahasranāma — Mahabharata (Anushasana Parva), as taught by Bhishma to Yudhishthira on his deathbed
As a Hindi name
श्रेष्ठ · adj
[वि॰ स्त्री॰ श्रेष्ठा] · सर्वोत्तम । उत्कृष्ट । बहुत अच्छा · मुख्य । प्रधान । प्रथम — Śabdasāgara
श्रेष्ठ · noun · masculine
कुबेर · विष्णु · द्विज । ब्राह्मण — Śabdasāgara
श्रेष्ठ · śreshṭha · adj.
Best, most excellent, excellent, very eminent or illustrious, pre-eminent, chief, higher, or highest, in rank; oldest, senior — Platts (1884), digital edition courtesy DSAL, University of Chicago, p. 727
श्रेष्ठ
excellent, high-quality, best
a Hindi word, a tatsama: the Sanskrit word borrowed unchanged into Hindi श्रेष्ठ — per Wiktionary’s etymology record
“Borrowed from Sanskrit श्रेष्ठ (śreṣṭha). Doublet of सेठ (seṭh).” — per Wiktionary’s etymology record
śreṣṭha mf(ā)n. most splendid or beautiful, most beautiful of or among (with gen.), RV.; AV.; R.
most excellent, best, first, chief (n. ‘the best or chief thing’), best of or among or in respect of or in (with gen. loc., or comp.), RV. &c. &c.
As a Sanskrit word
Meaning
most excellent, best, first, chief ( ‘the best or chief thing’), best of or among or in respect of or in (with gen. loc., or comp.), &c. &c.
Scripturally attested Verified derivationWhy this matches what you typed
M1 · same meaning "śreṣṭha" is the vocative of "śreṣṭhā" — the same word in a different grammatical case.
Gender counterpart
The kosha attests this stem in the feminine, the masculine, and the neuter — the same name serves without alteration.
Dictionary citations
śreṣṭha mf(ā)n. most splendid or beautiful, most beautiful of or among (with gen.), RV.; AV.; R.
most excellent, best, first, chief (n. ‘the best or chief thing’), best of or among or in respect of or in (with gen. loc., or comp.), RV. &c. &c.
better, more, distinguished, superior, better than (abl. or gen.), Mn.; MBh. &c.
most auspicious or salutary, VarBṛS.
oldest, senior, W.
śreṣṭhā (ā), f. an excellent woman, MW.
Hibiscus Mutabilis, L. (prob. w.r. for lakṣmī-śr˚)
Caveats
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