1. Pertaining to the nucleus of a cell.
  2. Pertaining to a centre around which something is developed or organised; central, pivotal.
  3. Pertaining to the atomic nucleus.
  4. Involving atomic energy.
    a nuclear reactor
  5. Of a weapon: deriving its force from rapid release of atomic energy.
    a nuclear explosion

The above text is a snippet from Wiktionary: nuclear
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