"Dominion"  originates from mid-15th century Middle English dominioun, meaning lordship or supreme authority, derived from Old French dominion and Medieval Latin dominium (ownership, lordship).  It stems from the Latin dominus ("lord, master"), which is rooted in domus ("house" or "household"), tracing back to the Proto-Indo-European root *dem- for household.  The original meaning of dominion denotes "right of uncontrolled possession, use, and disposal," evolving from the concept of a master ruling a household.  By the 1510s, it meant a territory or people subjected to a particular government's control.  It is often used to describe high-level, sometimes absolute, power, such as in the Biblical sense (Genesis 1:26) of human rule over creation, or in the historic designation of British self-governing colonies, such as the "Dominion of Canada".  Related words: Domain: Shares the same root of territory/control.  Domination: Implies control over others.  Domus/Domestic: Derived from the same Latin foundation of "house".  

According to the Oxford English Dictionary (OED), the earliest known use of the noun dominion in English is from around 1430.  It appears in the writings of the poet and prior John Lydgate.  The word is categorized in the Middle English period (1150–1500).  While it initially meant general "lordship" or "power," it began being used in political context to describe specific territories, such as Wales, as early as the 16th century (e.g., in the Laws in Wales Act 1535).  The term's colonial usage was later applied as an official title to Virginia around 1660 and to the Dominion of New England in 1686.   

According to the OED, the earliest known use of the noun domination is in the Middle English period, with the earliest evidence dating to around 1386.  The earliest known use of the adjective/noun domestic dates to before 1425.   The earliest known use of the noun domain in English is from before 1500.  The earliest known use of the noun domus in English is in the mid-1700s.  The earliest known use of the noun dominance in English is from 1823.  

The concept of dominion—defined as supreme authority, sovereignty, or control—is a fundamental pillar in storytelling, serving as a primary driver for plot, character development, and thematic depth. It explores the tension between power and responsibility, and the consequences of exercising authority.  

Here is an analysis of the importance of dominion in storytelling: 
Driving Narrative and Conflict:   
Power Struggles: Stories often revolve around characters seeking to establish, maintain, or overthrow dominion (e.g., political thrillers, fantasy epics, and dystopian fiction).  
Moral Turning Points: Dominion serves as a catalyst for critical moments, showcasing how authority is used—or abused—to shape the world within the story.  

Character Development and Responsibility:  
The Stewardship Model: True dominion, often seen in narratives exploring leadership, is framed not as exploitation but as responsible stewardship—a "shepherd" model of caring for the vulnerable.  
Internal Mastery: Beyond external power, dominion represents the internal discipline and control over one's own mind and character.  The Pursuit of Purpose: Characters exercising dominion often transition from victims to agents of change, pursuing authority to flip oppressive circumstances. 

Thematic Exploration of Values:  
Critique of Power: Stories often examine the "darkest of times" when the pursuit of dominion turns into tyranny, causing suffering and challenging the moral compass.  
Redemption and Authority: Stories of redemption frequently explore how a character moves from misusing power to using it for the greater good.  
The Evolution of Beliefs: Narratives can explore how ideas themselves exert dominion, reshaping cultural standards, such as the rise of empathy or the value of the individual. 

Setting the Stakes:  
Colossal Consequences: When the stakes involve "dominion" over a kingdom, planet, or society, the narrative gains an epic quality, forcing characters to face profound ethical dilemmas.  
Humanity vs. Nature/Technology: Stories often explore the limits of human dominion over the environment or AI, highlighting the dangers of uncontrolled mastery. 

Dominion in storytelling is rarely just about who is in charge; it is an exploration of why they are in charge, how they behave, and what that authority means for the world they inhabit.