Siege vs. Invasion — What's the Difference?

A siege is a military blockade of a city, or fortress, with the intent of conquering by attrition, or a well-prepared assault. This derives from Latin: sedere, lit. 'to sit'.

An invasion is a military offensive in which large numbers of combatants of one geopolitical entity aggressively enter territory owned by another such entity, generally with the objective of either conquering; liberating or re-establishing control or authority over a territory; forcing the partition of a country; altering the established government or gaining concessions from said government; or a combination thereof. An invasion can be the cause of a war, be a part of a larger strategy to end a war, or it can constitute an entire war in itself.

A military operation in which enemy forces surround a town or building, cutting off essential supplies, with the aim of compelling those inside to surrender

The act of invading, especially the entrance of an armed force into a territory to conquer.

A group of herons

The entry into bodily tissue and subsequent proliferation of an injurious entity, such as a pathogen or tumor.

The surrounding and blockading of a city, town, or fortress by an army attempting to capture it.

An intrusion or encroachment

A prolonged period, as of illness

A military action consisting of armed forces of one geopolitical entity entering territory controlled by another such entity, generally with the objective of conquering territory or altering the established government.

(Obsolete) A seat, especially a throne.

The entry without consent of an individual or group into an area where they are not wanted.

To subject to a siege; besiege

(medicine) The spread of cancer cells, bacteries and such to the organism.

(heading) Military action.

(surgery) The breaching of the skin barrier.

(US) A period of struggle or difficulty, especially from illness.

The act of invading; the act of encroaching upon the rights or possessions of another; encroachment; trespass.

(figuratively) A prolonged assault or attack.

A warlike or hostile entrance into the possessions or domains of another; the incursion of an army for conquest or plunder.

(heading) A seat.

The incoming or first attack of anything hurtful or pernicious; as, the invasion of a disease.

(obsolete) A seat, especially as used by someone of importance or authority.

The act of invading; the act of an army that invades for conquest or plunder

(obsolete) An ecclesiastical see.

Any entry into an area not previously occupied;

(obsolete) The place where one has his seat; a home, residence, domain, empire.

(pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body;

The seat of a heron while looking out for prey.

A flock of heron.

(obsolete) A toilet seat.

(obsolete) The anus; the rectum.

(obsolete) Excrements, stool, fecal matter.

(obsolete) Rank; grade; station; estimation.

(obsolete) The floor of a glass-furnace.

(obsolete) A place with a toilet seat: an outhouse; a lavatory.

To assault or blockade a city or fortress with the intent of conquering by force or attrition; to besiege.

A seat; especially, a royal seat; a throne.

Hence, place or situation; seat.

Rank; grade; station; estimation.

Passage of excrements; stool; fecal matter.

The sitting of an army around or before a fortified place for the purpose of compelling the garrison to surrender; the surrounding or investing of a place by an army, and approaching it by passages and advanced works, which cover the besiegers from the enemy's fire. See the Note under Blockade.

Hence, a continued attempt to gain possession.

The floor of a glass-furnace.

A workman's bench.

To besiege; to beset.

The action of an armed force that surrounds a fortified place and isolates it while continuing to attack