noun (n)

• an area in hostile territory that has been captured and is held awaiting further troops and supplies(noun.location)

  Example:
  The only foothold left for British troops in Europe was Gibraltar.
  

  Synonym:
  bridgehead
  

  source: wordnet30
• a place providing support for the foot in standing or climbing(noun.artifact)

  Synonym:
  footing
  

  source: wordnet30
• an initial accomplishment that opens the way for further developments(noun.act)

  Example:
  They are presently attempting to gain a foothold in the Russian market.
  

  Synonym:
  beachhead
  

  source: wordnet30
• A holding with the feet; firm standing; that on which one may tread or rest securely; footing.(noun)

  source: webster1913