datapoint
  A :term:`value` stored at a :term:`timestamp bucket`. If no value is recorded at a particular
  timestamp bucket in a :term:`series`, the value will be None (null).

function
  A time-series function which transforms, combines, or performs computations on one or more :term:`series`.
  See :doc:`functions`

metric
  See :term:`series`

metric series
  See :term:`series`
  
node
  An element of the name of a :term:`series` separated by periods (``.``).

precision
  See :term:`resolution`

resolution
  The number of seconds per datapoint in a :term:`series`. Series are created with a resolution
  which determines how often a :term:`datapoint` may be stored. This resolution is represented
  as the number of seconds in time that each datapoint covers. A series which stores one datapoint
  per minute has a resolution of 60 seconds. Similarly, a series which stores one datapoint per
  second has a resolution of 1 second.

retention
  The number of datapoints retained in a :term:`series`. Alternatively: The length of time datapoints
  are stored in a series.

series
  A named set of datapoints. A series is identified by a unique name, which is composed of
  elements (each, a :term:`node`) separated by periods (``.``) which are used to display the collection of series
  into a hierarchical tree. A series storing system load average on a server called ``apache02``
  in datacenter ``metro_east`` might be named as ``metro_east.servers.apache02.system.load_average``

series list
  A series name or wildcard which matches one or more :term:`series`. Series lists are received by
  :term:`functions <function>` as a list of matching series. From a user perspective, a series list is
  merely the name of a metric. For example, each of these would be considered a single series list:

  * ``metro_east.servers.apache02.system.load_average.1_min``,
  * ``metro_east.servers.apache0{1,2,3}.system.load_average.1_min``
  * ``metro_east.servers.apache01.system.load_average.*``

target
  A source of data used as input for a Graph. A target can be a single metric name, a metric wildcard,
  or either of these enclosed within one or more :term:`functions <function>`

timestamp
  A point in time in which :term:`values <value>` can be associated. Time in Graphite is represented
  as `epoch time <http://en.wikipedia.org/wiki/Epoch_time>`_ with a maximum resolution of 1-second.

timestamp bucket
  A :term:`timestamp` after rounding down to the nearest multiple of a :term:`series's <series>` :term:`resolution`.

value
  A numeric or null value. Values are stored as double-precision floats. Values are parsed using
  the python :py:func:`float` constructor and can also be None (null). The range and precision of
  values is system dependent and can be found by executing (with Python 2.6 or later)::
  python -c 'import sys; print sys.float_info'