Adjective
to
something
or
someone
moving
forward
and
back
to
the
same
position
.
Noun
The
movement
(
of
someone
or
something
)
forward
followed
by
a
return
to
the
same
position
.
May
refer
to
a
concept
such
as
an
emotional
state
or
a
relationship
as
well
as
a
physical
thing
.
Verb
To
go
back and forth
;
to
alternate
.
Adverb
;
with
a
reciprocating
motion
.