incidental

[1]	incidental expense , minor expense

adj.

[1]	casual , chance , fortuitous , aleatory , random , haphazard , serendipitous , unpredictable , accidental , adventitious , unplanned , unlooked-for , (Colloq) fluky
[2]	subordinate , secondary , ancillary , minor , lesser , non-essential , unimportant , trivial , negligible , inconsequential , insignificant , petty , trifling , paltry
[3]	incident
[4]	nonessential
[5]	attendant , consequent , accompanying , concomitant , ensuant , resultant , sequent