What is meant by the term "spacetime"?

Question

What's entanglement?

Answer 1

space time is theory, it is not an individually absolute
concept, it depends on relative motion between
different objects and distinct observers......
Different observers will have different answers
from their point of reference.....
We all exist in space time, yet space & time as a
whole are different from the parts which we try
to understand with our perceptions which can and
do show illusions of our mind-set ...
You can find this idea of space & time in Einstein's
Special Relativity Theory ........

entanglement falls under Quantum Physics and deals
with the phenomenon of spatially distant particles having
correlated properties .......

Answer 2

Hi,

Entanglement means that while for a long time people separated the concepts of space and time, they are actually linked in ways that cannot be divided. So these days we keep them linked together. (in four dimentional gravity calculations for example)

More info available at the references that the others put.

Hope that helps,
Matt

Answer 3

space-time  /ˈspeɪsˈtaɪm/ Pronunciation Key - Show Spelled Pronunciation[speys-tahym] Pronunciation Key - Show IPA Pronunciation

–noun 1. Also called space-time continuum. the four-dimensional continuum, having three spatial coordinates and one temporal coordinate, in which all physical quantities may be located.
2. the physical reality that exists within this four-dimensional continuum.
–adjective 3. of, pertaining to, or noting a system with three spatial coordinates and one temporal coordinate.
4. noting, pertaining to, or involving both space and time: a space-time problem.

Answer 4

click here:http://en.wikipedia.org/wiki/Spacetime