A "separate interview" refers to an interview where individuals are interviewed individually, one at a time, rather than as a group or together with others. Full definition
The procedures for intake include separate interviews with each parent. (familycourt.gov.au)
If you are shortlisted in more than one category you will have separate interviews for each category on the same day. (telstrabusinesswomensawards.com)
The family consultant will conduct separate interviews with you and the other party. (federalcircuitcourt.gov.au)