## space-time

[-tīm**′**]

noun

- a four-dimensional continuum with four coordinates, the three dimensions of space and that of time, in which any event can be locatedalso called space-time continuum
- the physical reality inherent in such a continuum

## space-time

noun

*Physics*

## space-time

(*countable and uncountable*, *plural* spacetimes)

- (uncountable, physics) The four-dimensional continuum of the three spatial dimensions plus time.
- (physics) An
*n*-dimensional continuum consisting of dimensions of both space & time. Normally spacetime is considered as having 4 dimensions (*x*,*y*,*z*,*t*), but higher-dimensional spacetimes are often encountered in theoretical physics, e.g. the 5-dimensional spacetime of Kaluza-Klein theory or the 11 dimensions of spacetime in M-theory. - (physics) A specific region of the universe with mathematically different properties than the surrounding spacetime. Synonymous with "metric" within the context of general relativity.
- "a Schwarzschild spacetime," "a Reissner-Nordström spacetime," etc. as opposed to sense (2) describing the universe's spacetime as a whole: "a Minkowski spacetime," "a 5-dimensional spacetime," etc.

- timescape

(*uncountable*)

- (physics) Alternative form of
*spacetime*.

## space-time - Computer Definition

The following units of measure are used to define digital capacities and speeds. The long scale below shows the powers of 10 in many European countries. For measurements of a meter, see metric system. See binary values, NIST binary and long scale.
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** 10 to the**
**Bits or Bytes Power of:**
Kilo (K) Thousand 3
Mega (M) Million 6
Giga (G) Billion 9
Tera (T) Trillion 12
**Bytes**
Peta (P) Quadrillion 15
Exa (E) Quintillion 18
Zetta (Z) Sextillion 21
Yotta (Y) Septillion 24
Bronto Octillion 27
Geop Nonillion 30
** Storage Capacity Is Measured in:**
CPU word size bits
Disk/tape/USB drive bytes
Memory (RAM) bytes
Memory chip bits
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**Fractions of a second 10 to the**
**Second Power of:**
Millisecond (ms) Thousandth -3
Microsecond (µs) Millionth -6
Nanosecond (ns) Billionth -9
Picosecond (ps) Trillionth -12
Femtosecond (fs) Quadrillionth -15
Attosecond (as) Quintillionth -18
Zeptosecond (zs) Sextillionth -21
Yoctosecond (ys) Septillionth -24
**Transmit/Transfer Speed Measured in:**
Parallel bus/channel bytes/sec
Parallel disk drive bytes/sec
Serial bus/channel bits/sec
Serial disk drive bits/sec
Network & communications bits/sec
Disk access time ms
Memory access time ns
Machine cycle µs, ns
Instruction execution µs, ns
Transistor switching ns, ps, fs
** CPU Speed - Clock Cycles Per Second**
See Hertz.
kilohertz (kHz) thousand
megahertz (MHz) million
gigahertz (GHz) billion
terahertz (THz) trillion