Week 22

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Across
  1. 4. existing only in the imagination
  2. 5. as an alternative or substitute
  3. 6. forming a necessary base or core; of central importance
  4. 8. the part of mathematics in which letters and other general symbols are used to represent numbers and quantities in formulae and equations
  5. 9. a device for making and breaking the connection in an electric circuit
Down
  1. 1. follow (someone or something) in order to catch or attack them
  2. 2. a book listing individuals or organizations alphabetically or thematically with details such as names, addresses, and telephone numbers
  3. 3. a poisonous substance secreted by animals such as snakes, spiders, and scorpions and typically injected into prey or aggressors by biting or stinging
  4. 6. a military stronghold, especially a strongly fortified town fit for a large garrison
  5. 7. state that one refuses to admit the truth or existence of