(computing) An update required before the user is allowed to continue using the software.

Elite military forces engaged in unconventional operations such as guerrilla warfare or counterterrorism.

plural of reconnaissance in force

(military) An attack by a body of troops to gauge the strength of the enemy.

plural of forced heir

(law) A person who, under the laws of a particular jurisdiction, can not be disinherited, even by a will.

plural of forced heirship

(law) The circumstance of a forced heir existing.

plural of normal force

(physics) The unit of force in the system of Planck units, equal to the amount of force required to accelerate one Planck mass by one Planck acceleration: F_P=(c⁴)/G≈1.21⨯10⁴⁴ mbox N