quo·ni·am^[1]

because
since
whereas

Synonyms for quoniam

postquam – after, because
quandoquidem – because, since
quatenus – as, how far, in order that, seeing that, since, that, to what extent, where
quatinus – as, how far, in order that, seeing that, since, that, to what extent, where
quia – because
quod – because, that, the fact that, the point that, what, whereas, which
siquidem – indeed, since
ubi – as soon as, when, whereas, whereby, wherein
utpote – inasmuch as, namely, seeing that, since

Similar to quoniam

quo – to what place, to which place, where, whither
quodammodo – in a certain measure, in a certain way
quomodo – how, in what manner, in whatever way, somehow
quoque – also, too
quotiens – often
quotienscumque – however often
quovis – to whatever place you will
iam – already, by now, further, henceforth, immediately, indeed, just, moreover, now, presently, soon
Corbeiam – Corbie
etiam – also, and furthermore, as yet, besides, even, still