Where can one find the meaning of bodhisatta in ebt ?
https://suttacentral.net/define/bodhisatta You’ll need to convert the pts reference if you want in-sutta examples
Since a being who aspires to Bodhi or Awakening is bodhisatta , does each one of us is a bodhisatta ? Can sariputta , mongallana etc be considered bodhisatta , this is their last life also ?
It depends who you ask (different traditions have different views), but with respect to the EBTs, I think it’s reasonably safe to say: no, it only refers to the ‘aspirant’ Gotama before he became the Buddha (or, eg. the ‘aspirant’ Kasyapa, if you’re interested in previous Buddhas).
I don’t know if a very in depth exploration of the question is something you’re looking for, but just in case Ven. Analayo’s The Genesis of the Bodhisattva Ideal may be of interest to you.
This may also be a of help for your question.