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10/40 Window
The area of the world that extends from West Africa to East Asia, and from 10 degrees north to 40 degrees north of the equator.
10-40 map

Agencies
Organizations that provide screening, training, missionary care and administrative assistance to missionaries. They specialize in particular regions and ministry focuses.

Career Missionary
These are a missionaries who immerse themselves and their family in the culture of a foreign field by maintaining residence there for the purpose of evangelism and/or leadership development.

Church Planting
This involves developing fellowships that reflect the kingdom of God in the world. These fellowships are characterized by people who have accepted Christ as their Savior and make up part of the Body of Christ. They are focused on reproducing followers of Christ as they teach new members who then share their faith with others.

Church Planting Movement
This is a rapid and multiplicative increase of indigenous churches planting additional churches within a given people group or population segment.

Closed Country
A country that limits or prevents Christian ministry by expatriates (non-native) missionaries. (Also known as Creative Access or Restricted-Access Countries.)

Creative Access Country
Using non-traditional means to gain formal permission to live and minister in a closed country for an extended period of time.  Examples of such means include being a student, teacher, businessman, medical professional. These government-approved occupations are the primary work of a missionary in this situation.

Evangelical Christian
These Christians believe that Jesus Christ is the sole source of salvation through faith in him. They have a personal faith that began with a time of conversion. They recognize the Bible as the inspired Word of God and the only basis for faith and Christian living and are committed to biblical preaching and evangelism that brings others to faith in Christ.

Field Missionaries
Individuals serving in an area that isn't their passport country.

Finisher
This is a missionary who has retired from a corporate or ministry career and chooses to maintain residence in a foreign field for the purpose of ministry as a second career.

Furlough

This refers to when a missionary takes time away from the field to reconnect with his or her supporting churches and seeks time to refresh his or her mind and body.

The Great Commission
This is the command found in Matthew 28:19, 20 when Jesus instructed his followers to carry his truth to all nations and make disciples.

Humanitarian Aid
Disaster relief and medical intervention for those in need.

The Last Frontier

This is a missions-related term that refers to the unreached people groups that have little or no access to the gospel of Jesus Christ. It is also called "World A."

Last Frontier People Group
This is an unreached people group that has not had a new evangelical church started in it within the past two years.

MBB (Muslim Background Believer)
Someone who has become a believer from a Muslim background.

MK (Missionary Kid)
This is a term used to refer to the a child of a missionary.

National Workers

Individuals who reside and minister in their passport country. They are fluent in the native language and have an understanding of that culture.

People Group
This is a homogenous group of individuals, families and clans who share a common language and sense of ethnic identity.

Short-term trip
This type of missions experience is often designed to assist missionaries with teaching, construction, humanitarian aid. Those serving often commit a week to six months.

Tentmaking
Generally, the term "tentmaking" refers to the activities of any Christian who, while functioning as a minister, receives little or no pay for his or her church work, and supports him or herself by additional, unrelated work. Specifically, tentmaking can also refer to a method of international Christian evangelism in which missionaries support themselves by working full time in the marketplace with their skills and education, instead of receiving financial support from a church. The term comes from the fact that the apostle Paul supported himself by making tents while living and preaching in Corinth (Acts 18:3).

Unreached People Group
This is a people group in which less than two percent of the population is considered evangelical Christians.

Vision Trips
Individuals considering missions as a career experience missions on the field may commit one to two years to a trip to get to know the culture, the needs and the language.