Esplendor translates to "splendor" or "magnificence". It's a beautiful, poetic word that you won't hear in everyday conversation, making it a special addition to your vocabulary.
In the song, Carla Morrison offers her lover not just physical things, but "todo mi esplendor" (all my splendor). She's offering the entirety of her magnificent being and the brilliance of her love, making it a deeply romantic and powerful statement.
Carla Morrison does not hold back on this track: she is offering every single part of herself to make someone feel safe and loved. Right from the start, she asks for permission to get close, singing "Déjame tomarte de la mano" [Let me take you by the hand] and "Déjame besarte ahí / Donde guardas tus secretos" [Let me kiss you there / Where you keep your secrets]. It feels intimate and direct, as if she is promising to love both the bright spots and the parts you try to hide from everyone else.
Then comes the chorus, which turns into a literal gift list of her own body and spirit. She offers her lap with "Te regalo mis piernas / Recuesta tu cabeza en ellas" [I gift you my legs / Rest your head on them] and even volunteers her own energy whenever the other person runs out ("Te regalo mis fuerzas / Úsalas cada que no tengas" [I gift you my strength / Use it whenever you have none]). Notice how she uses the casual contraction "pa'" instead of "para" in "pa' que sientas lo que sentí" [so that you feel what I felt] and "pa' hacerte muy feliz" [to make you very happy]. It keeps her bold vow of "Te voy a amar hasta morir" [I am going to love you until I die] sounding like a warm, late-night confession between two people.