Last Updated：2025/12/07
(physics) also known as the stationary action principle. In complex systems, the tendency for any movement or change to use the least action, and therefore amount of energy possible. This is true on a subatomic level, on the population level (evolution), and on a macro level. Not considered a law of physics because it is not true 100% of the time.
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principle of least action
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Source Word
principle of least action
Noun
uncountable
(physics)
also
known
as
the
stationary
action
principle.
In
complex
systems,
the
tendency
for
any
movement
or
change
to
use
the
least
action,
and
therefore
amount
of
energy
possible.
This
is
true
on
a
subatomic
level,
on
the
population
level
(evolution),
and
on
a
macro
level.
Not
considered
a
law
of
physics
because
it
is
not
true
100%
of
the
time.
Japanese Meaning
最小作用の原理：物理学において、あらゆる動きや変化が可能な限り作用やエネルギー消費を最小限に抑えようとする傾向を示す原理。サブ原子レベルから集団（進化）レベル、マクロな現象にまで及ぶが、常に成り立つわけではなく、厳密な物理法則とはみなされない。
Sense（1）
(physics)
also
known
as
the
stationary
action
principle.
In
complex
systems,
the
tendency
for
any
movement
or
change
to
use
the
least
action,
and
therefore
amount
of
energy
possible.
This
is
true
on
a
subatomic
level,
on
the
population
level
(evolution),
and
on
a
macro
level.
Not
considered
a
law
of
physics
because
it
is
not
true
100%
of
the
time.
