adjective

added to an existing or usual amount or number; additional.

they offered him an extra thirty-five cents an hour

additional,more,added,supplementary,supplemental,further,auxiliary,ancillary,subsidiary,secondary,attendant,accessory,other,another,new,fresh

adverb

to a greater extent than usual; especially.

he is trying to be extra good

exceptionally,particularly,specially,especially,very,extremely,singularly,peculiarly,distinctly,unusually,extraordinarily,uncommonly,uniquely,remarkably,strikingly,outstandingly,amazingly,incredibly,awfully,terribly,really,unwontedly,notably,markedly,decidedly,surprisingly,conspicuously,signally,seriously,majorly,mucho,jolly,dead,well,devilish,frightfully,powerful,right

noun

an item in addition to what is usual or strictly necessary.

I had an education with all the extras

addition,supplement,adjunct,addendum,add-on,bonus,accompaniment,complement,companion,additive,extension,appendage,accessory,attachment,retrofit,peripheral