The difference between defined and undefined terms is that the defined terms can be combined with each other and with undefined terms to define still more terms.
These are undefined terms:
1.plane
2.point
3.line
These are defined terms:
1.ray
2.union of sets
3.space
4.subset
5.set
6.proper subset
7.opposite rays
8.postulate
9.betweenness of points
10.bisector of a segment
11.midpoint of a segment
12.line segment
13.lenght of a segment
14.collinear points
15.complement of a set
16.coplanar points
17.disjoint sets
18.element
19.empy set
20.finite set
21.geometry
22.infinite set
23.intersection of sets
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It is a very basic concept which cannot be defined. Undefined terms are used to define other concepts. In Euclidean geometry, for example, point, line and plane are not defined.
"Defined items" are defined in terms of "undefined terms".
Psycho-Geometry is defined as measurement of the earth together with consciousness of the reciprocal relationship between man and the objects of the environment and between the objects themselves.- Dr.MARIA MONTESSORI
The relationship between the two shafts is actually defined by the helix ....Racks also feature in the theory of gear geometry, where, for instance, the tooth shape ...
Point is not an undefined term. It can be defined as a mathematically precise location, or as the place where two lines intersect.