Noun
A
theoretical
line
(
physically
or
mentally
)
followed
from
a
point
of
origin
or
towards
a
destination
.
May
be
relative
(
e
.
g
.
up
,
left
,
outbound
,
dorsal
),
geographical
(
e
.
g
.
north
),
rotational
(
e
.
g
.
clockwise
),
or
with
respect
to
an
object
or
location
(
e
.
g
.
toward
Boston
).