Today's word is..
Marrying late in life.
From the Greek phrase for 'late marriage.' I'd paste it in, but LJ doesn'tlike Greek writing!
First seen 1824: McCulloch Scotland III. 287 "Nor is there any danger of Donald's being flogged for opsigamy by the Highland nymphs as the Spartans were of old."
Frank found himself standing at the altar, staring at a priest with dozens of strangers behind him, and an oddly excited woman in white next to him. He asked himself how he came o be standing there, and then realised his wife-to-be must have confused her words when they were talking at that book store - he was talking to her about opsimathy, the act of learning late in life, and she mst have heard opsigamy!