Microhistories

noun plural
Marginally different strands of reality, caused by sequences of events where various different things happen with subatomic particles throughout the universe.
Source
Oracle

Recipriversexclusion

noun
A number whose existence can only be defined as being anything other than itself.
Origin
Portmanteau of ‘reciprocal’, ‘reverse’, and ‘exclusion’.
Source
Life, the Universe and Everything

Pentathanaluna

noun
The malady referred to by laymen as the Five-Day Reversible Death.
Origin
Formed from pénte (five), thánatos (death), and lūna (the moon).
Source
Dimension of Miracles

Hilfer

noun informal
An ethnologist of high intelligence life forms.
Source
Rocannon’s World

Neantics

noun
The ontology of nothingness.
Origin
Derived from neán (young).
Source
The Sanatorium of Dr Vliperdius

Chrownotransductionology

noun
Temporal slippage induced by chrownons; in other words: timely travel.
Origin
Professor Gladys Chrowdingler, discoverer of the chrownon.
Source
Automated Alice

Metalogical

adjective
Short form of psycho-physio-philosophilogical: relating to the mentality, morphology, and ideology of species.
Source
Look to Windward

Psychohistory

noun
A branch of mathematics dealing with the reactions of human conglomerates to fixed social and economic stimuli.
Source
Foundation