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  1. incidental expense (frequently plural) an expense not budgeted or not specified
  2. ostentatious intended to attract notice and impress others
  3. interest expense interest paid on loans
  4. incidental music music composed to accompany the action of a drama or to fill intervals between scenes
  5. personal expense the cost of personal or family living
  6. incidental minor or casual or subordinate in significance or nature
  7. instantaneousness the quickness of action or occurrence
  8. incidentally by the way (used to introduce a new topic)
  9. instantaneous occurring with no delay
  10. medical expense amount spent for diagnosis or treatment or prevention of medical problems
  11. at any expense regardless of the cost involved
  12. operating expense the expense of maintaining property
  13. business expense ordinary and necessary expenses incurred in a taxpayer's business or trade
  14. travel expense (frequently plural) expenses incurred by an employee in the performance of the job and usually reimbursed by the employer
  15. promotional expense the cost of promoting a product
  16. trade expense ordinary and necessary expenses incurred in a taxpayer's business or trade
  17. incident a single distinct event
  18. exponential expression a mathematical expression consisting of a constant (especially e) raised to some power
  19. non-cash expense an expense that is not paid for in cash
  20. antecedent a preceding occurrence or cause or event