Definitions of posture:

• noun:   position or arrangement of the body and its limbs
• noun:   characteristic way of bearing one's body

  Example: "Stood with good posture"

• noun:   a rationalized mental attitude
• noun:   capability in terms of personnel and materiel that affect the capacity to fight a war

  Example: "Politicians have neglected our military posture"

• verb:   behave affectedly or unnaturally in order to impress others

  Example: "She postured and made a total fool of herself"

• verb:   assume a posture as for artistic purposes