1. a prefix meaning `across', `beyond', freely applied in geographical terms (transcontinental, trans-Australian), also found attached to stems not used as words, and in figurative meanings, as transpire, transport, transcend.

2. a prefix meaning `across' in the sense of changing from one state to another, as in transgender, transsexual.
3. Chemistry See cis-trans isomerism.
{Latin, combining form of trans (preposition)

Australian English dictionary. 2014.