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## linear

```  3  definitions  found

From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]:

Linear  \Lin"e*ar\  (-[-e]*[~e]r),  a.  [L.  linearis,  linearius  fr
linea  line:  cf  F.  lin['e]aire.  See  3d  {Line}.]
1.  Of  or  pertaining  to  a  line  consisting  of  lines;  in  a
straight  direction;  lineal.

2.  (Bot.)  Like  a  line  narrow;  of  the  same  breadth
throughout,  except  at  the  extremities;  as  a  linear  leaf.

{Linear  differential  equation}  (Math.),  an  equation  which  is
of  the  first  degree,  when  the  expression  which  is  equated
to  zero  is  regarded  as  a  function  of  the  dependent
variable  and  its  differential  coefficients.

{Linear  equation}  (Math.),  an  equation  of  the  first  degree
between  two  variables;  --  so  called  because  every  such
equation  may  be  considered  as  representing  a  right  line

From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]:

Micrometer  \Mi*crom"e*ter\,  n.  [Micro-  +  -meter:  cf  F.
microm[`e]tre.]
An  instrument,  used  with  a  telescope  or  microscope,  for
measuring  minute  distances,  or  the  apparent  diameters  of
objects  which  subtend  minute  angles.  The  measurement  given
directly  is  that  of  the  image  of  the  object  formed  at  the
focus  of  the  object  glass.

{Circular,  or  Ring},  {micrometer},  a  metallic  ring  fixed  in
the  focus  of  the  object  glass  of  a  telescope,  and  used  to
determine  differences  of  right  ascension  and  declination
between  stars  by  observations  of  the  times  at  which  the
stars  cross  the  inner  or  outer  periphery  of  the  ring.

{Double  image  micrometer},  a  micrometer  in  which  two  images
of  an  object  are  formed  in  the  field,  usually  by  the  two
halves  of  a  bisected  lens  which  are  movable  along  their
line  of  section  by  a  screw,  and  distances  are  determined
by  the  number  of  screw  revolutions  necessary  to  bring  the
points  to  be  measured  into  optical  coincidence.  When  the
two  images  are  formed  by  a  bisected  object  glass,  it  is
called  a  divided-object-glass  micrometer,  and  when  the
instrument  is  large  and  equatorially  mounted,  it  is  known
as  a  heliometer.

{Double  refraction  micrometer},  a  species  of  double  image
micrometer,  in  which  the  two  images  are  formed  by  the
double  refraction  of  rock  crystal.

{Filar,  or  Bifilar},  {micrometer}.  See  under  {Bifilar}.

{Micrometer}  {caliper  or  gauge}  (Mech.),  a  caliper  or  gauge
with  a  micrometer  screw,  for  measuring  dimensions  with
great  accuracy.

{Micrometer  head},  the  head  of  a  micrometer  screw.

{Micrometer  microscope},  a  compound  microscope  combined  with
a  filar  micrometer,  used  chiefly  for  reading  and
subdividing  the  divisions  of  large  astronomical  and
geodetical  instruments.

{Micrometer  screw},  a  screw  with  a  graduated  head  used  in
some  forms  of  micrometers.

{Position  micrometer}.  See  under  {Position}.

{Scale},  or  {Linear},  {micrometer},  a  minute  and  very
delicately  graduated  scale  of  equal  parts  used  in  the
field  of  a  telescope  or  microscope,  for  measuring
distances  by  direct  comparison.

From  WordNet  r  1.6  [wn]:

linear
adj  1:  (mathematics)  directly  proportional  [syn:  {additive}]  [ant:
{nonlinear}]
2:  of  or  in  or  along  or  relating  to  a  line  involving  a  single
dimension;  "a  linear  foot"  [syn:  {one-dimensional}]  [ant:
{planar},  {cubic}]
3:  (electronics)  of  a  circuit  or  device  having  an  output  that
is  proportional  to  the  input;  "analogue  device";  "linear
amplifier"  [syn:  {analogue},  {analog}]  [ant:  {digital}]
4:  of  a  leaf  shape;  long  and  narrow  [syn:  {elongate}]
5:  measured  lengthwise;  "cost  of  lumber  per  running  foot"  [syn:
{running(a)}]
```