(1) In this Part -

"antecedent order" means - (a) a maintenance order, (b) a variation order, (c) an interim order, (d) an order under section 48 insofar as it is deemed under that section to be a maintenance order, or (e) an order for maintenance pending suit under section 116 or a periodical payments order or secured periodical payments order under Part 12;

"attachment of earnings order" means an order under section 53;

"desertion" includes conduct on the part of one civil partner that results in the other civil partner, with just cause, leaving and living separately and apart from the first civil partner;