semestral
six-monthly, biannual
Origin: From Latin semestris (of six months), from sex (six) + mensis (month).
Usage Note
Semestral means occurring every six months or lasting a semester. It is invariable for gender (un informe semestral, una reunión semestral) and adds -es in the plural. Note the distinction from bimestral (every two months) and trimestral (quarterly): semestral is always every six months. In university contexts a semestre is a term of roughly five months, and semestral describes anything belonging to that period.
Examples
"Publicamos un informe semestral de resultados."
Natural Translation
We publish a six-monthly results report.

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