Ok

bien

(all right, permitted)

normal

(in good health or in a good emotional state — see also well)

OK

(acknowledgement or acceptance)

bien

(acknowledgement or acceptance)

bueno

(acknowledgement or acceptance)

de acuerdo

(acknowledgement or acceptance)

vale

(acknowledgement or acceptance)

ya

(acknowledgement or acceptance)

OK

(endorsement; approval)

visto bueno

(endorsement; approval)

dar el visto bueno

(to approve)