intercurrent
Coming between, temporally; intervening in time.
[B]esides the intercurrent offices of life, his reception of Visits, answering of Letters, his constant Preaching and Catechising, he found leisure to write his Tract of Fundamentals, his Paraenesis, his Review of the Annotations […].
Simultaneous; occurring at the same time as, or during the period of, another condition.
In intercurrent pneumonia, or such as occurs in the course of another disease, the absence of the characteristic expectoration, according to M. Andral, is noticed.
Not belonging to any particular season.
Where it comes from
Borrowed from Latin intercurrens, equivalent to inter- + current.
Adapted from the Wiktionary entry intercurrent (CC BY-SA 4.0).