Crossword/ˈkrɔːswɜːrd/ Definition 1 of 1Pro Tip 1/3Variety of Topics Crosswords cover a wide range of topics; improve vocabulary in different subjects by playing. The crossword included clues from history and science. Pro Tip 2/3Cultural References Some clues may refer to popular culture or events, reflecting the puzzle's creation time. That crossword had a clue about a 90s sitcom. Pro Tip 3/3Active Brain Exercise Crosswords are a fun way to practice English while stimulating your brain. She enjoys her daily crossword as a mental workout.