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

dynamic typing
dynamically typed

    Enforcement of type rules at run time as
   opposed to compile time.  Dynamic typing catches more errors
   as run-time exceptions than static typing.

   Tcl, Perl, PHP, Python and Visual Basic are examples
   of dynamically typed languages.  A dynamically typed language
   may have strong typing or weak typing.

   (2004-07-20)