In this division:
"birth parent", of a child, means—
(a) the woman who gave birth to the child; or
(b) the other person (if any) presumed under division 2.2 to be a parent of the child.
"birth sibling", of a child, means a brother or sister of the child who is born as a result of the same pregnancy as the child.
"commercial substitute parent agreement"—see section 40.
"parentage order "means an order under section 26.
"procedure" means the procedure of transferring into the uterus of a woman an embryo derived from an ovum fertilised outside her body.
"substitute parent", of a child—see section 24 (1) (c).
"substitute parent agreement" means a contract, agreement, arrangement or understanding under which—
(a) a woman agrees—
(i) that the woman will become, or attempt to become, pregnant; and
(ii) that a child born as a result of the pregnancy will be taken to be (whether by adoption, agreement or otherwise) the child of someone else; or
(b) a woman who is pregnant agrees that a child born as a result of the pregnancy will be taken to be (whether by adoption, agreement or otherwise) the child of someone else.