Equilibrium
Equilibrium was the sense of balance in biology, enabling lifeforms to keep upright when standing or walking.

In 2369, emergency transporter armbands modified to create a subspace isolation field, caused Deanna Troi's equilibrium to get into disorder, which made her feel a little dizzy. ()

In 2376, Tuvok suffered from space sickness, which included the symptoms of gastrointestinal distress and a slight loss of equilibrium. ()

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Biology