Population

thumb|A census taker visits a family of indigenous Dutch Travellers living in a caravan in the [[Netherlands in 1925.]] A census (from Latin censere, 'to assess') is the procedure of systematically acquiring, recording, and calculating information about the members of a given population, which are then usually displayed through statistics. This term is used mostly in connection with national population and housing censuses; other common censuses include censuses of agriculture, traditional culture, business, supplies, and traffic censuses. The United Nations (UN) defines the essential features

A refugee, according to the United Nations High Commissioner for Refugees (UNHCR), is a person "forced to flee their own country and seek safety in another country. They are unable to return to their own country because of feared persecution as a result of who they are, what they believe in or say, or because of armed conflict, violence or serious public disorder." Such a person may be called an asylum seeker until granted refugee status by a contracting state or by the UNHCR if they formally make a claim for asylum.

thumb|right|upright=1.5|Net migration rates per 1,000 people in 2023. On net people travel from redder countries to bluer countries.

thumb|upright=1.35|Two men and a child, all dead from starvation during the Russian famine of 1921–1922 A famine is a widespread scarcity of food caused by several possible factors, including, but not limited to: war, natural disasters, crop failure, widespread poverty, an economic catastrophe or government policies. This phenomenon is usually accompanied or followed by regional malnutrition, starvation, epidemic, and increased mortality. Every inhabited continent in the world has experienced a period of famine throughout history. During the 19th and 20th centuries, Southeast and South Asia, a

thumb|Japanese government poster in the early 20th century promoting emigration to South America, with Japanese Brazilians| Brazil highlighted

ensemble of individuals of a species in an area, or their number

statistical measure of how long a person or organism may live, based on factors of their life

measure of the number of deaths in a population from a given cause, scaled by population, in a set period of time

statistical concept of infant deaths

thumb|upright 1.3|Comparison of male and female life expectancy at birth for countries and territories as defined by [[World Health Organization|WHO for 2019. The green dotted line corresponds to equal female and male life expectancy. Open the original svg-image in a separate window and hover over a bubble to see more detailed information. The square of the bubbles is proportional to the country's population based on estimation of the UN.]]

Infanticide (or infant homicide) is the intentional killing of infants or offspring. Infanticide was a widespread practice throughout human history that was mainly used to dispose of unwanted children, its main purpose being the prevention of resources being spent on weak or disabled offspring. Unwanted infants were usually abandoned to die of exposure, but in some societies they were deliberately killed. Infanticide is generally illegal, but in some places the practice is tolerated, or the prohibition is not strictly enforced.

thumb|upright=1.6|right|Map showing urban areas with at least ten million inhabitants in 2025, according to the Global Human Settlement Layer|GHSL

study of the dynamics of species populations and how these populations interact with the environment

involuntary or coerced movement of a person or persons away from their home or home region

field of lengthening human lifespan by means such as tissue rejuvenation or gene therapy

A lūstrum (, plural lūstra) was a term for a five-year period in Ancient Rome.

government organization in New York, United States

ratio of males to females in a population

thumb|Metapopulations are important in fisheries. The local population (1.) serves as a source for hybridization with surrounding subspecies populations (1.a, 1.b, and 1.c).The populations are normally spatially separated and independent but spatial overlap between them during breeding times allows for gene flow between the populations. A metapopulation consists of a group of spatially separated populations of the same species which interact at some level. The term metapopulation was coined by Richard Levins in 1969 to describe a model of population dynamics of insect pests in agricultural fie

table which shows probability of death

Population may refer to:

Fecundity is a descriptor of productivity that can be defined in multiple ways; including the capability to produce offspring. It may refer to the level of fertility of human, animal, and organic life as measured by the number of gametes (eggs), seed set, or asexual propagules. Additionally, it is the potential for reproduction of a recorded population as opposed to a sole organism.

Panmixia (or panmixis) means uniform random fertilization, which means individuals do not select a mate based on physical traits. A panmictic population is one where all potential parents may contribute equally to the gamete pool, and that these gametes are uniformly distributed within the gamete population (gamodeme). This assumes that there are no hybridising restrictions within the parental population: neither genetics, cytogenetics nor behavioural; and neither spatial nor temporal (see also Quantitative genetics for further discussion). True panmixia is rarely, if ever, observed in natural

quantitative study of human population in the past

state of the reproductive system without evidence of disease, disorders, or deficiencies

exponential growth based on a constant rate

growth of bacterial colonies

total fertility rate that (if sustained) leads to each new generation being less populous

movement of a large group of people from one region to another

UN conference held in Cairo from 5–13 September 1994. Its resulting Program of Action is the steering document for the United Nations Population Fund

study of biological populations

number of times a female has given birth to a baby

demographics of country

village in Šumadija, Serbia

killing of young offspring by adult animals of the same species

mathematical equation related to human death rate

Ibaji is a Local Government Area in Kogi State, Nigeria in the south of the state separated from Edo State to the west by the Niger River, and bordering Anambra State in the south. Its headquarters are in the town of Onyedega on the Niger River in the northwest of the area at. Olu is the predominant dialect used in Ibaji local government area. They are all Igala.

historical practice

difference between the number of immigrants and emigrants per time and divided by population

global human population statistics

Wikimedia list article

measure of how populations and goods move over time

decrease in birth rates during the COVID-19 pandemic

Repopulation is the phenomenon of increasing the numerical size of human inhabitants or organisms of a particular species after they had almost gone extinct.

study of the relationship between politics and population change

age-structured model of population growth

growth function exhibiting a singularity in a finite time

the repeated increase and decrease of a species' population over time