Learn That Word

Synonyms for Coincident (same or very similar meaning)

WordNet sense 1 (occurring or operating at the same time):
coincidental, concurrent, simultaneous, coinciding, cooccurring, co-occurrent

WordNet sense 2 (occurring or existing at the same time or having the same period or phase):
synchronous, synchronal, synchronic

WordNet sense 3 (coinciding when superimposed):
congruent


From the ODE community, based on WordNetadd/edit