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Simultaneously

Simultaneously is an adverb meaning at the same time; occurring or existing at one moment in time or within a shared time frame. The related adjective simultaneous describes something that happens at the same time; the adverb form is formed by adding -ly. Etymology traces to Latin simul meaning together and -taneus, with the form evolving through French and English.

In ordinary language, the word is used to indicate coincidence of events or actions, as in “The

In music, simultaneous notes or chords are those sounding at the same moment. In linguistics and everyday

See also synchronization, concurrency, clock synchronization, event, and reference frames.

fireworks
and
the
light
show
happened
simultaneously.”
In
mathematics,
simultaneous
appears
in
the
phrase
simultaneous
equations—systems
of
equations
solved
together
for
multiple
variables.
In
science
and
technology,
the
term
appears
in
contexts
such
as
simultaneous
computation
or
parallel
processing,
where
several
tasks
are
executed
at
the
same
time,
or
in
synchronization,
where
timing
relationships
are
maintained
across
components.
In
physics,
the
concept
of
simultaneity
is
central
to
discussions
of
time
and
measurement;
in
Einsteinian
relativity,
whether
two
events
are
simultaneous
depends
on
the
observer's
frame
of
reference.
speech,
simultaneous
action
may
be
described
as
occurring
together,
often
with
verbs
used
in
parallel.