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onto
preposition
showing
movement
to
a
position
on
the
surface
of
or
in
contact
with
something
•
The
cat
leaped
onto
the
windowsill
to
watch
the
birds
outside
.
The
cat
leaped
onto
the
windowsill
to
watch
the
birds
outside
.
•
The
waiter
carefully
placed
the
tray
onto
the
table
without
spilling
a
drop
.
The
waiter
carefully
placed
the
tray
onto
the
table
without
spilling
a
drop
.
from
on
+
to
,
first
appearing
as
one
word
in
the
18th
century
adjective
(
mathematics
)
describing
a
function
that
maps
every
element
of
its
codomain
to
at
least
one
element
of
its
domain
;
surjective
•
In
the
graph
on
the
board
,
the
professor
showed
that
function
f
is
onto
.
In
the
graph
on
the
board
,
the
professor
showed
that
function
f
is
onto
.
•
A
surjective
or
onto
mapping
hits
every
point
in
the
codomain
.
A
surjective
or
onto
mapping
hits
every
point
in
the
codomain
.
specialized
use
of
the
common
preposition
in
1930s
mathematical
literature
as
a
synonym
for
"
surjective
"
