acknowledge

verb

1.
declare to be true or admit the existence or reality or truth of
2.
report the receipt of
3.
express recognition of the presence or existence of, or acquaintance with
Derived from:
acknowledgment
4.
express obligation, thanks, or gratitude for
Derived from:
acknowledgment
5.
accept as legally binding and valid
6.
accept (someone) to be what is claimed or accept their power and authority
Derived from:
acknowledgment