"Food security" is often used to talk about the concept of food affordability." The phrase food security can be understood in several different ways, including from a national security perspective...

• Access to a food supply that is sanitary and safe from terroristic threats

... and from a food access perspective. (Definitions in this realm often have significant overlap but vary in the scope and specificity of the elements included.)

• USDA: "Access by all members at all times to enough food for an active, healthy life. Food security includes at a minimum
• the ready availability of nutritionally adequate and safe foods, and
• an assured ability to acquire acceptable foods in socially acceptable ways (that is, without resorting to emergency food supplies, scavenging, stealing or other coping strategies)."
• FAO: "All people, at all times, have access to sufficient, safe and nutritious food to meet their dietary needs and food preferences for an active and healthy life"
• Some prespectives explicitly highlight the need for culturally appropriate food, within the realm of meeting food preferences.
  
• Academy of Nutrition and Dietetics:
• Global food security addresses underlying causes of hunger through country-led initiatives & action by international institutions, with a focus on the sustainability of a healthy and safe food supply chain.
• National food security is concerned with the survival of the country by securing "national biodiversity, ecosystem preservation, agricultural sustainability, and biosecurity."
• Community food security means that all residents can "obtain a safe, culturally appropriate, nutritionally sound diet" in a (economically & environmentally) sustainable system that supports community self-reliance and social justice.
• Household food security means that all members members of the household have nutritionally adequate and
  safe food at all times, via socially acceptable ways.

Related terms: community food security, food insecurity

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Poverty can be defined

• in a more abstract sense, as linked to food insecurity, limited healthy food access, and prevalence of overweight or obesity & its associated health problems
• See A Review of Community Food Security Literature, for example
  
• concretely, by using a cut off such as the federal poverty level
  

Related terms: low-income, low economic resources

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The word access can be used in several divergent senses, including

• Economic ability to purchase food
• Or more broadly, ability to produce, purchase, or receive food
• Spatial proximity to a food source
• Facility with which information can be viewed or used by the public
• Referring to handicapped accessibility to a location

A definition of food access provided by the Academy of Nutrition and Dietetics is very inclusive of concepts relating to the first two bullet points:

"A food-security concept that includes availability or adequacy of supply of healthy food; accessibility or
the location of the food supply and the distance to that location (can refer to a community level or within
a household); affordability refers to food prices and people’s perception of worth relative to the cost;
acceptability or people’s attitudes about attributes of their local food environment and degree that local
food meets certain personally held standards; and accommodation or how well local food sources accept
and adapt to local residents’ needs, such as store hours and types of payments accepted."

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Food deserts are defined in terms of nutrition...

• "Locales that lack access to stores or markets that sell food needed to maintain a healthy diet. These locations often have a surfeit of fast-food establishments" (Review of Community Food Security Literature)
  

...and/or affordability.

• "Area in the United States with limited access to affordable and nutritious food, particularly such an area composed of predominantly lower income neighborhoods and communities" (The Northside Healthy Eating Project)

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Within the tag family "Values, Justifications, & Motivations," in the "Food Justice" cluster.

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