diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index def6ae64c09..875eea00830 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -325,9 +325,9 @@ are always available.  They are listed here in alphabetical order.
    < abs(b)``.
 
 
-.. function:: enumerate(sequence[, start=0])
+.. function:: enumerate(iterable[, start=0])
 
-   Return an enumerate object. *sequence* must be a sequence, an
+   Return an enumerate object. *iterable* must be a sequence, an
    :term:`iterator`, or some other object which supports iteration.  The
    :meth:`__next__` method of the iterator returned by :func:`enumerate` returns a
    tuple containing a count (from *start* which defaults to 0) and the
diff --git a/Objects/enumobject.c b/Objects/enumobject.c
index 08c7c096cad..5c60d8ca2e9 100644
--- a/Objects/enumobject.c
+++ b/Objects/enumobject.c
@@ -16,7 +16,7 @@ enum_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	enumobject *en;
 	PyObject *seq = NULL;
 	PyObject *start = NULL;
-	static char *kwlist[] = {"sequence", "start", 0};
+	static char *kwlist[] = {"iterable", "start", 0};
 
 	if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:enumerate", kwlist,
 					 &seq, &start))
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index de3f0f4846a..23e87b38411 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -369,9 +369,9 @@ filter_next(filterobject *lz)
 }
 
 PyDoc_STRVAR(filter_doc,
-"filter(function or None, sequence) --> filter object\n\
+"filter(function or None, iterable) --> filter object\n\
 \n\
-Return an iterator yielding those items of sequence for which function(item)\n\
+Return an iterator yielding those items of iterable for which function(item)\n\
 is true. If function is None, return the items that are true.");
 
 PyTypeObject PyFilter_Type = {
@@ -1174,7 +1174,7 @@ builtin_iter(PyObject *self, PyObject *args)
 }
 
 PyDoc_STRVAR(iter_doc,
-"iter(collection) -> iterator\n\
+"iter(iterable) -> iterator\n\
 iter(callable, sentinel) -> iterator\n\
 \n\
 Get an iterator from an object.  In the first form, the argument must\n\
@@ -1942,10 +1942,10 @@ builtin_sum(PyObject *self, PyObject *args)
 }
 
 PyDoc_STRVAR(sum_doc,
-"sum(sequence[, start]) -> value\n\
+"sum(iterable[, start]) -> value\n\
 \n\
-Returns the sum of a sequence of numbers (NOT strings) plus the value\n\
-of parameter 'start' (which defaults to 0).  When the sequence is\n\
+Returns the sum of an iterable of numbers (NOT strings) plus the value\n\
+of parameter 'start' (which defaults to 0).  When the iterable is\n\
 empty, returns start.");