imaginary line
Conceptual spatial division
An imaginary line is a conceptual line that doesn't physically exist but helps organize understanding—lines of latitude and longitude, the equator, time zone boundaries, or the lines separating states on a map.
The ball crossed the imaginary line between the goal posts.
Such lines exist only by agreement or mental construction.
Midpoint circle of rotation
- meridianPole-to-pole great circle
- latitudeGeographic or personal freedom
- longitudeEast-west angular distance
- tropicWarm Earth zone
hemisphere · prime meridian · time zones · parallels · Arctic Circle · Antarctic Circle · Tropic of Cancer · Tropic of Capricorn
Rotation reference line
- planeWinged flying vehicle
- tangentLine touching curve once
- secantTrig ratio, 1/cos
- bisectorLine splitting something equally
diagonal · perpendicular · parallel · asymptote · vector · coordinate · intersection · vanishing point
Outer edge or limit
- frontierEdge of settlement
- demarcationFormal boundary setting
- thresholdPoint of beginning
- divisionSplitting into parts
partition · separation · territorial · jurisdiction · no-man's-land · disputed territory · exclusion zone · buffer zone
Point of beginning
- boundaryLine marking a limit
- distinctionNotable difference or honor
- separationState of being apart
- divideSeparate into parts
spectrum · continuum · gray area · overstep · limit · demarcation · theoretical · hypothetical
equator
Midpoint circle of rotation
- meridianPole-to-pole great circle
- latitudeGeographic or personal freedom
- longitudeEast-west angular distance
tropic · hemisphere · prime meridian · time zones · parallels · Arctic Circle · Antarctic Circle · Tropic of Cancer · Tropic of Capricorn · great circle
axis
Rotation reference line
bisector · diagonal · perpendicular · parallel · asymptote · vector · coordinate · intersection · vanishing point · datum
border
Outer edge or limit
- frontierEdge of settlement
- demarcationFormal boundary setting
- thresholdPoint of beginning
division · partition · separation · territorial · jurisdiction · no-man's-land · disputed territory · exclusion zone · buffer zone · perimeter
threshold
Point of beginning
- boundaryLine marking a limit
- distinctionNotable difference or honor
- separationState of being apart
divide · spectrum · continuum · gray area · overstep · limit · demarcation · theoretical · hypothetical · arbitrary
imaginary linefence
Boundary structure between properties
wall · concrete barrier · border wall · barrier · boundary fence
imaginary linefortification
Strengthening defenses or nutrients
defensive wall · geographic feature · perimeter fence · security barrier · checkpoint
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