18-letter words containing z, e, l
- self-actualization — the achievement of one's full potential through creativity, independence, spontaneity, and a grasp of the real world.
- self-fertilization — Botany. fertilization of an ovum of a plant by a male gamete from the same flower (opposed to cross-fertilization).
- territorialization — to extend by adding new territory.
- tranquillizer dart — a dart filled with a tranquillizer that is shot from a gun in order to temporarily sedate an animal so that it may be handled safely
- universalizability — the thesis that any moral judgment must be equally applicable to every relevantly identical situation
- witch hazel family — the plant family Hamamelidaceae, characterized by trees and shrubs having alternate, simple leaves, flowers in clusters or heads, and fruit in the form of a double-beaked woody capsule, and including the sweet gum, witch alder, and witch hazel.
- zermelo set theory — (mathematics) A set theory with the following set of axioms: Extensionality: two sets are equal if and only if they have the same elements. Union: If U is a set, so is the union of all its elements. Pair-set: If a and b are sets, so is {a, b}. Foundation: Every set contains a set disjoint from itself. Comprehension (or Restriction): If P is a formula with one free variable and X a set then {x: x is in X and P(x)}. is a set. Infinity: There exists an infinite set. Power-set: If X is a set, so is its power set. Zermelo set theory avoids Russell's paradox by excluding sets of elements with arbitrary properties - the Comprehension axiom only allows a property to be used to select elements of an existing set.