noun (n)

• a particular point in time(noun.time)

  Example:
  The moment he arrived the party began.
  

  Synonym:
  instant, minute, second
  

  source: wordnet30
• an indefinitely short time(noun.time)

  Example:
  Wait just a moment.
  

  Synonym:
  bit, minute, mo, second
  

  source: wordnet30
• at this time(noun.time)

  Example:
  She is studying at the moment.
  

  Synonym:
  here and now, present moment
  

  source: wordnet30
• having important effects or influence(noun.attribute)

  Example:
  Virtue is of more moment than security.
  

  Synonym:
  consequence, import
  Antonym:
  inconsequence
  

  source: wordnet30
• a turning force produced by an object acting at a distance (or a measure of that force)(noun.phenomenon)

  source: wordnet30
• the n-th moment of a distribution is the expected value of the n-th power of the deviations from a fixed value(noun.cognition)

  source: wordnet30
• A minute portion of time; a point of time; an instant; as, at that very moment.(noun)

  source: webster1913