noun (n)

• fourth Thursday in November in the United States; second Monday in October in Canada; commemorates a feast held in 1621 by the Pilgrims and the Wampanoag(noun.time)

  Synonym:
  thanksgiving day
  

  source: wordnet30
• a short prayer of thanks before a meal(noun.communication)

  Synonym:
  blessing, grace
  

  source: wordnet30
• The act of rending thanks, or expressing gratitude for favors or mercies.(noun)

  source: webster1913