Definitions of host computer

A central computer, such as a mainframe computer at a company’s headquarters or central office. The central computer in a star network.www.jpma.com/pos_software/retail_software_glossary.asp

The mainframe computer in a WAN.

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Also called the development computer, the host computer runs the debugger in a two-machine debugging scenario. Most often, the host computer is also the computer on which the KEXT is being developed. See also two-machine debugging; target computer.

developer.apple.com/documentation/DeviceDrivers/Conceptual/WritingDeviceDriver/Glossary/chapter_12_section_1.html
The source for an application or media. Live Channel turns your computer into a streaming host for other "clients" to connect to.www.channelstorm.com/Manual/Data/GL00/GL00.htm

Refers to the computer at the processor that is dialed for authorization and settlement.www.123processing.com/Services/Glossary/glossary.html

The primary controlling computer in a multiple computer system. the term is normally used for relatively more powerful or large computers.

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The primary computer in a multi-computer network. The unit issues commands, has access to the most important data, and is the most versatile processing element in the system.www.atlab.com/viewArticle.aspx

A computer that performs central processing for a telecommunications network.www.crfonline.org/orc/glossary/h.html

In a data communications system, a main computer that is connected to several devices (such as terminals or personal computers).arkedu.state.ar.us/ade-guide/glossary2.html

The computer that is connected directly to your satellite ITU and IRU modems (also called adapters).http://www.google.co.in/url?sa=X&start=9&oi=define&ei=Wk8sR8jVKY_ssgLStfGkAQ&sig2=8Y4L9mPVgeZST7V7t-I9mQ&q=http://www.apet.net/satnetwork/glossary.htm&usg=AFQjCNFlsOKE41om0KIvVAyNADXyzzNGrA