A fortification is a strong wall, building, or other reinforced structure that's used to defend against attack. In medieval times, castle fortifications protected them from invading armies.

If you've ever built a fort in your living room or back yard, you know what a fortification is—fort is the shortened form, and the source word is the Latin fortificare, "make strong." Another meaning of fortification is "the act of making something (or someone) stronger," so you might talk about the fortification your math team got from taking an online calculus class or the fortification of your favorite breakfast cereal with vitamins.

Definitions of fortification
  1. noun
    the act of increasing the strength of something
    synonyms: strengthening
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    the act of reducing the strength of something
    strengthening the concentration (as of a solute in a mixture) by removing diluting material
    the concentration of a colloidal solution whose colloid will not pass through a semipermeable membrane; solution is placed in a bag of the membrane and the solvent is evaporated off
    type of:
    increase, step-up
    the act of increasing something
  2. noun
    defensive structure consisting of walls or mounds built around a stronghold to strengthen it
    synonyms: munition
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    Maginot Line
    a fortification built before World War II to protect France's eastern border; initially considered to be impregnable, it was easily overrun by the German army in 1940
    Siegfried line
    German fortifications facing the Maginot Line
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    projecting part of a rampart or other fortification
    bunker, dugout
    a fortification of earth; mostly or entirely below ground
    a large building formerly occupied by a ruler and fortified against attack
    the arrangement of defensive fortifications to protect against enemy fire
    entrenchment, intrenchment
    an entrenched fortification; a position protected by trenches
    escarp, escarpment, protective embankment, scarp
    a steep artificial slope in front of a fortification
    a temporary fortification built by troops in the field
    temporary fortification like a detached bastion
    fortification consisting of a strong fence made of stakes driven into the ground
    breastwork, parapet
    fortification consisting of a low wall
    (military) a temporary or supplementary fortification; typically square or polygonal without flanking defenses
    fortification consisting of a fence made of a line of stout posts set firmly for defense
    fox hole, foxhole
    a small dugout with a pit for individual shelter against enemy fire
    funk hole
    dugout as a place of safe retreat (when in a funk)
    a projecting parapet supported by corbels on a medieval castle; has openings through which stones or boiling water could be dropped on an enemy
    entrenchment consisting of an additional interior fortification to prolong the defense
    type of:
    defence, defense, defensive structure
    a structure used to defend against attack
  3. noun
    the art or science of strengthening defenses
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    type of:
    art, artistry, prowess
    a superior skill that you can learn by study and practice and observation
  4. noun
    the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)
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    type of:
    act of making fuller or more meaningful or rewarding
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