mittjähr
Mittjähr is a rarely attested German term that historically appears to refer to the middle of the year or to events occurring at mid-year. In modern standard German, the word is not common and is generally considered archaic or regional; more common expressions for a mid-year point are in der Mitte des Jahres or neighboring phrases, while for frequency or recurrence people use halbjährlich or zweimal jährlich.
The term is composed from mitt- meaning middle and Jahr meaning year, aligning with a semantic sense
Present-day usage and guidance
In current German writing, mittjähr is typically avoided in favor of clearer expressions. For periodicity, halbjährlich
Halbjährlich, halbjährig, zweimal jährlich, Mitte des Jahres.