As used in sections 523.200 to 523.215, the following words mean:
(1) "Displaced person", any person that moves from the real property or moves his personal property from the real property permanently and voluntarily as a direct result of the acquisition, rehabilitation or demolition of or the written notice of intent to acquire such real property, in whole or in part, for a public purpose;
(2) "Public agency", the state of Missouri or any political subdivision or any branch, bureau or department thereof, any public school district, and any quasi-public corporation created or existing by law which are authorized to acquire real property for public purpose and which acquire any such property either partly or wholly with aid or reimbursement from federal funds;
(3) "Urban redevelopment corporation", as defined in section 353.020.