Names #334, #490 · Viṣṇu Sahasranāma
आदिदेवःādidevaḥ
Adideva — appears 2 times in the stotram, each with its own meaning
Name #334
The first of the gods
From shloka 36 · chapter Narasiṃha
स्कन्दः स्कन्दधरो धुर्यो वरदो वायुवाहनः ।
वासुदेवो बृहद्भानुरादिदेवः पुरन्दरः ॥
skandaḥ skandadharo dhuryo varado vāyuvāhanaḥ
vāsudevo bṛhadbhānurādidevaḥ purandaraḥ
Also in this shloka: skandaḥ · skandadharaḥ · dhuryaḥ · varadaḥ · vāyuvāhanaḥ · vāsudevaḥ · bṛhadbhānuḥ · purandaraḥ
Name #490
The primordial god
From shloka 52 · chapter Vāmana
गभस्तिनेमिः सत्त्वस्थः सिंहो भूतमहेश्वरः ।
आदिदेवो महादेवो देवेशो देवभृद्गुरुः ॥
gabhastinemiḥ sattvasthaḥ siṃho bhūtamaheśvaraḥ
ādidevo mahādevo deveśo devabhṛdguruḥ
Also in this shloka: gabhastinemiḥ · sattvasthaḥ · siṃhaḥ · bhūtamaheśvaraḥ · mahādevaḥ · deveśaḥ · devabhṛdguruḥ