Here are lines from "Richard III":
Farewell. The leisure and the fearful time
Cuts off the ceremonious vows of love
And ample interchange of sweet discourse
Which so long sundered friends should dwell upon.
Not just these lines, but the entire monologue scans perfectly. Except for the line that contains the word "ceremonious." Which, according to today's dictionaries, has five syllables. For the line to scan properly, it should be four.
This is, perhaps, the opposite of the "ambitious" thing (the word oft-repeated in Antony's monologue in "Julius Caesar": "But Brutus says he was ambitious." For the line properly to scan, it requires one more syllable. The one hypothesis I ran across somewhere stated that back in Shakespeare's time, the word ambitious was pronounced "am-bi-shey-es," providing that necessary extra syllable).
Has "ceremonious" undergone the ... uh ... reverse transformation? Was it pronounced "ce-re-mon-yes" or something like that back in Shakespeare's day?