Adjective
Of
a
matrix
:
having
undergone
with
the
result
that
the
leading
coefficient
or
pivot
(
that
is
,
the
first
nonzero
number
from
the
left
)
of
a
nonzero
row
is
to
the
right
of
the
pivot
of
the
row
above
it
,
giving
rise
to
a
stepped
appearance
in
the
matrix
.
Noun
A
level
or
rank
in
an
organization
,
profession
,
or
society
.
Verb
To
form
troops
into
an
echelon
.