And in this Act, unless there be something repugnant in the subject or context, “registered” means registered under the law for the registration of documents for the time being in force: a person is said to have “notice” of a fact either when he actually knows that fact, or when, but for wilful abstention from inquiry or gross negligence, he would have known it, or when information of the fact is given to or obtained by his agent, under the circumstances mentioned in the Contract Act, 1872, section 229; and all expressions used herein and defined in the Contract Act, 1872, shall be deemed to have the meanings respectively attributed to them by that Act.