mid-December adjective 1adverb 1noun 1 adjective1 •Happening in the middle of December. adverb1 •In the middle of December. noun1 •Any time in the middle of December.Trump’s overall approval rating on immigration policy fell from 50% in March, before he launched crackdowns in several major U.S. cities, to 41% in mid-December, for what had been his strongest issue. — 2025