authorise,
authorize,
clear,
pass grant authorization or clearance for; "Clear the manuscript for publication"; "The rock star never authorized this slanderous biography"
ratify,
sign be engaged by a written agreement; "He signed to play the casino on Dec. 18"; "The soprano signed to sing the new opera"
co-sign,
cosign sign jointly; "Husband and wife co-signed the lease"
probate establish the legal validity of (wills and other documents)
formalise -
make formal or official; "We formalized the appointment and gave him a title"
