THE ANSWER:
The missing word is REASSUMING.
Each set of words is an anagram: LEGISLATOR = ALLEGORIST, INFURIATED = UNRATIFIED, and REASSUMING = MEASURINGS.
Thanks for playing! Tomorrow is Think Thursday.
12 Really Forced Portmanteaux That Didn’t Catch On
9 Weapons That Failed Spectacularly (and 1 That Possibly Didn’t)
11 Facts About the Ambidextrous
The Founder of Mother’s Day Later Fought to Have It Abolished
11 Problems Music Can Solve