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 for array
From The Free On-line Dictionary of Computing (30 December 2018) :

     1.  A collection of identically typed data items
     distinguished by their indices (or "subscripts").  The number
     of dimensions an array can have depends on the language but is
     usually unlimited.
     An array is a kind of aggregate data type.  A single
     ordinary variable (a "{scalar") could be considered as a
     zero-dimensional array.  A one-dimensional array is also known
     as a "{vector".
     A reference to an array element is written something like
     A[i,j,k] where A is the array name and i, j and k are the
     indices.  The C language is peculiar in that each index is
     written in separate brackets, e.g. A[i][j][k].  This expresses
     the fact that, in C, an N-dimensional array is actually a
     vector, each of whose elements is an N-1 dimensional array.
     Elements of an array are usually stored contiguously.
     Languages differ as to whether the leftmost or rightmost index
     varies most rapidly, i.e. whether each row is stored
     contiguously or each column (for a 2D array).
     Arrays are appropriate for storing data which must be accessed
     in an unpredictable order, in contrast to lists which are
     best when accessed sequentially.  Array indices are
     integers, usually natural numbers, whereas the elements of
     an associative array are identified by strings.
     2.  A processor array, not to be confused with
     an array processor.

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