diff --git a/docs/mllp.rst b/docs/mllp.rst
index 99c60c5..d8a52ed 100644
--- a/docs/mllp.rst
+++ b/docs/mllp.rst
@@ -56,7 +56,7 @@ HL7 Sender
         await hl7_writer.drain()
         print(f'Sent message\n {hl7_message}'.replace('\r', '\n'))
 
-        # Now wait for the ACK message from the receiever
+        # Now wait for the ACK message from the receiver
         hl7_ack = await asyncio.wait_for(
           hl7_reader.readmessage(),
           timeout=10
diff --git a/hl7/containers.py b/hl7/containers.py
index fe43826..18df865 100644
--- a/hl7/containers.py
+++ b/hl7/containers.py
@@ -144,8 +144,8 @@ class File(Container):
     It contains a list of :py:class:`hl7.Batch`
     instances. It may contain FHS/FTS :py:class:`hl7.Segment` instances.
 
-    Files may or may not be wrapped in FHS/FTS segements
-    deliniating the start/end of the batch. These are optional.
+    Files may or may not be wrapped in FHS/FTS segments
+    delineating the start/end of the batch. These are optional.
     """
 
     def __init__(
@@ -209,7 +209,7 @@ def __str__(self):
         """Join a the child batches into a single string, separated
         by the self.separator.  This method acts recursively, calling
         the children's __unicode__ method.  Thus ``unicode()`` is the
-        approriate method for turning the python-hl7 representation of
+        appropriate method for turning the python-hl7 representation of
         HL7 into a standard string.
 
         If this batch has FHS/FTS segments, they will be added to the
@@ -235,8 +235,8 @@ class Batch(Container):
     It contains a list of :py:class:`hl7.Message` instances.
     It may contain BHS/BTS :py:class:`hl7.Segment` instances.
 
-    Batches may or may not be wrapped in BHS/BTS segements
-    deliniating the start/end of the batch. These are optional.
+    Batches may or may not be wrapped in BHS/BTS segments
+    delineating the start/end of the batch. These are optional.
     """
 
     def __init__(
@@ -300,7 +300,7 @@ def __str__(self):
         """Join a the child messages into a single string, separated
         by the self.separator.  This method acts recursively, calling
         the children's __unicode__ method.  Thus ``unicode()`` is the
-        approriate method for turning the python-hl7 representation of
+        appropriate method for turning the python-hl7 representation of
         HL7 into a standard string.
 
         If this batch has BHS/BTS segments, they will be added to the
@@ -557,11 +557,11 @@ def create_ack(
 
         msh.assign_field(str(source_msh(1)), 1)
         msh.assign_field(str(source_msh(2)), 2)
-        # Sending application is source receving application
+        # Sending application is source receiving application
         msh.assign_field(
             str(application) if application is not None else str(source_msh(5)), 3
         )
-        # Sending facility is source receving facility
+        # Sending facility is source receiving facility
         msh.assign_field(
             str(facility) if facility is not None else str(source_msh(6)), 4
         )
@@ -592,7 +592,7 @@ def __str__(self):
         """Join a the child containers into a single string, separated
         by the self.separator.  This method acts recursively, calling
         the children's __unicode__ method.  Thus ``unicode()`` is the
-        approriate method for turning the python-hl7 representation of
+        appropriate method for turning the python-hl7 representation of
         HL7 into a standard string.
 
         >>> str(hl7.parse(message)) == message
diff --git a/hl7/parser.py b/hl7/parser.py
index a26cbe1..b985a54 100644
--- a/hl7/parser.py
+++ b/hl7/parser.py
@@ -386,12 +386,12 @@ class _ParsePlan:
 
     # field, component, repetition, escape, subcomponent
 
-    def __init__(self, seperator, separators, containers, esc, factory):
+    def __init__(self, separator, separators, containers, esc, factory):
         # TODO test to see performance implications of the assertion
         # since we generate the ParsePlan, this should never be in
         # invalid state
-        assert len(containers) == len(separators[separators.find(seperator) :])
-        self.separator = seperator
+        assert len(containers) == len(separators[separators.find(separator) :])
+        self.separator = separator
         self.separators = separators
         self.containers = containers
         self.esc = esc
@@ -411,7 +411,7 @@ def container(self, data):
     def next(self):
         """Generate the next level of the plan (essentially generates
         a copy of this plan with the level of the container and the
-        seperator starting at the next index.
+        separator starting at the next index.
         """
         if len(self.containers) > 1:
             # Return a new instance of this class using the tails of