Meanings
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1
adj
approximately transitive; allowing a weaker or graded relation between the first and third terms when successive pairs are related
Russell calls similarity quasi-transitive because two objects each resembling a third need not resemble one another equally closely.
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2
adj
describing a graph on which the automorphism group has only finitely many vertex orbits
The infinite graph is quasi-transitive even though no automorphism sends every vertex to every other vertex.
Thesaurus
Etymology
Formed from quasi- ("as if; almost"), from Latin quasi, + transitive. In mathematics and logic, the prefix marks a relation or structure that retains a weakened form of transitivity rather than satisfying the ordinary property exactly.