Nother reason for one to not consider Merriam-Webster as authoritative.
Merriam-Webster has been failing for over 50 years. From The Gambit by Rex Stout (1962), featuring Nero Wolfe:
Mr. Wolfe is in the middle of a fit. It’s complicated. There’s a fireplace in the front room, but it’s never lit because he hates open fires. He says they stultify mental processes. But it’s lit now because he’s using it. He’s seated in front of it, on a chair too small for him, tearing sheets out of a book and burning them. The book is the new edition, the third edition, of Webster’s New International Dictionary, Unabridged, published by the G. & C. Merriam Company of Springfield, Massachusetts. He considers it subversive because it threatens the integrity of the English language….