Adjective
Not
accompanied
by
anything
else
;
one
in
number
.
Noun
A
vinyl
record
with
one
song
on
side
A
and
one
on
side
B
,
usually
7
inches
in
diameter
and
played
at
45
RPM
.
Verb
To
get
a
hit
that
advances
the
batter
exactly
one
base
.