fixedness, immobility, stationariness - remaining in place

system, scheme - a group of independent but interrelated elements comprising a unified whole; "a vast system of production and distribution and consumption keep the country going"

root - (botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground

derivation - the source from which something derives (i.e. comes or issues); "he prefers shoes of Italian derivation"

spring - a point at which water issues forth

headspring, fountainhead, head - the source of water from which a stream arises; "they tracked him back toward the head of the stream"

headwaters - the source of a river; "the headwaters of the Nile"

wellhead, wellspring - the source of water for a well

jumping-off place, point of departure - a place from which an enterprise or expedition is launched; "one day when I was at a suitable jumping-off place I decided to see if I could find him"; "my point of departure was San Francisco"

place of origin, provenance, birthplace, cradle - where something originated or was nurtured in its early existence; "the birthplace of civilization"

home - place where something began and flourished; "the United States is the home of basketball"

point source - a spatially constricted by concentrated source (especially of radiation or pollution)

trail head, trailhead - the beginning of a trail

point - the precise location of something; a spatially limited location; "she walked to a point where she could survey the whole street"