Is Samadhi mentioned in Jhana Suttas? Do the Pali texts on jhana actually mention Samadhi and/or One-Pointedness by name in the jhana descriptions or is this mention apocryphal?
The terms 'jhana', 'samadhi' &amp; 'one-pointedness' ('ekaggataṃ') are all found in the sutta passage below:

And what is the faculty of concentration? Katamañca, bhikkhave,
samādhindriyaṃ?
It’s when a noble disciple, relying on letting go, gains concentration,
gains unification of mind. Idha, bhikkhave, ariyasāvako
vossaggārammaṇaṃ karitvā labhati samādhiṃ, labhati cittassa
ekaggataṃ.
Quite secluded from sensual pleasures, secluded from unskillful
qualities, they enter and remain in the first absorption... So
vivicceva kāmehi vivicca akusalehi dhammehi savitakkaṃ savicāraṃ
vivekajaṃ pītisukhaṃ paṭhamaṃ jhānaṃ upasampajja viharati.
SN 48.10