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Pioneer in this puzzle’s theme Crossword Clue Answer is…
Answer: FERMI
This clue last appeared in the WSJ Crossword on April 13, 2023. You can also find answers to past WSJ Crosswords.
Related WSJ Crossword Answers

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Clue & Answer Definitions
- FERMI (noun)
- a metric unit of length equal to one quadrillionth of a meter
- Italian nuclear physicist (in the United States after 1939) who worked on artificial radioactivity caused by neutron bombardment and who headed the group that in 1942 produced the first controlled nuclear reaction (1901-1954)
- PIONEER (verb)
- take the lead or initiative in; participate in the development of
- open up an area or prepare a way
- PIONEER (noun)
- someone who helps to open up a new line of research or technology or art
- one of the first colonists or settlers in a new territory
That should be all the information you need to solve for the crossword clue and fill in more of the grid you’re working on! Be sure to check more Crossword Clues, Crossword Answers, and our other Word Game coverage.