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facultative    音标拼音: [f'ækəlt,etɪv]
facultative
adj 1: of or relating to the mental faculties
2: able to exist under more than one set of conditions; "a
facultative parasite can exist as a parasite or a saprophyte"
[ant: {obligate}]
3: granting a privilege or permission or power to do or not do
something; "a facultative enactment"
4: not compulsory; "facultative courses in the sciences"

Facultative \Fac"ul*ta*tive\, a. [L. facultas, -atis, faculty:
cf. F. facultatif, G. fakultativ.]
1. Having relation to the grant or exercise faculty, or
authority, privilege, license, or the like hence,
optional; as, facultative enactments, or those which
convey a faculty, or permission; the facultative
referendum of Switzerland is one that is optional with the
people and is necessary only when demanded by petition;
facultative studies; -- opposed to {obligatory} and
{compulsory}, and sometimes used with to.
[Webster 1913 Suppl.]

2. Of such a character as to admit of existing under various
forms or conditions, or of happening or not happening, or
the like; specif.: (Biol.) Having the power to live under
different conditions; as, a facultative parasite, a plant
which is normally saprophytic, but which may exist wholly
or in part as a parasite; -- opposed to {obligate}.
[Webster 1913 Suppl.]

3. (Physiol.) Pertaining to a faculty or faculties.

In short, there is no facultative plurality in the
mind; it is a single organ of true judgment for all
purposes, cognitive or practical. --J.
Martineau.
[Webster 1913 Suppl.]

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  • Trilateration - Wikipedia
    In geometry, trilateration is defined as the process of determining absolute or relative locations of points by measurement of distances, using the geometry of circles, spheres or triangles In surveying, trilateration is a specific technique
  • How GPS Receivers Work – Trilateration vs Triangulation
    As GPS satellites broadcast their location and time, trilateration measure distances to pinpoint their exact position on Earth While surveyors use triangulation to measure distant points, GPS positioning does not involve any angles whatsoever
  • Triangulation Vs Trilateration - June 17, 2025 - MapScaping
    Triangulation and trilateration are both methods used in surveying, navigation, and geolocation to determine the position of a point by measuring angles or distances to it from known points However, they differ in their approaches and applications
  • Trilateration | Distance, Geometry, Navigation | Britannica
    trilateration, method of surveying in which the lengths of the sides of a triangle are measured, usually by electronic means, and, from this information, angles are computed
  • 11. Trilateration | The Nature of Geographic Information
    Trilateration is an alternative to triangulation that relies upon distance measurements only Electronic distance measurement technologies make trilateration a cost-effective positioning technique for control surveys
  • Trilateration vs Triangulation: How does trilateration work?
    What is trilateration? Trilateration, in terms of GPS (global positioning system), means positioning from three distances It’s the use of distances for determining the unknown coordinates of a point of interest
  • GPS. gov: Trilateration Exercise
    To teach you the basic concept of how GPS works, we will conduct an exercise to demonstrate trilateration Trilateration is determining a position by knowing your distance from at least 3 known points In GPS those known points are the satellites themselves
  • gps - Differences between triangulation and trilateration - Geographic . . .
    Trilateration = working with distances In real world applications you often work with both, or combine them For example, total station surveys measure both distances and angles On the other hand, GPS receivers use trilateration concepts, where speed and time equals a distance, to determine your position
  • TRILATERATION Definition Meaning - Merriam-Webster
    The meaning of TRILATERATION is the measurement of the lengths of the three sides of a series of touching or overlapping triangles on the earth's surface for the determination of the relative position of points by geometrical means (as in geodesy, map making, and surveying)
  • What is the difference between trilateration and triangulation?
    The key difference between trilateration and triangulation is that trilateration uses distances to find positions, while triangulation uses angles and a known baseline Both are essential in surveying, with trilateration widely used in GPS technology and triangulation in land and topographic mapping





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