Why is the ninth month called September?
early 13c., from Old French tribulacion (12c.), from Late Latin tribulationem (nominative tribulatio) "distress, trouble, affliction" (c.200), from tribulatus, past participle of tribulare "to oppress, afflict," a figurative use by Christian writers of Latin tribulare "to press," also possibly "to thresh out grain," from tribulum "threshing sledge," from stem of terere "to rub" (see throw (v.)) + -bulum, suffix forming names of tools.
trouble or affiction of any kind (Deut. 4:30; Matt. 13:21; 2 Cor. 7:4). In Rom. 2:9 "tribulation and anguish" are the penal sufferings that shall overtake the wicked. In Matt. 24:21, 29, the word denotes the calamities that were to attend the destruction of Jerusalem.