diff --git a/README.md b/README.md
index c164823..c9298b2 100644
--- a/README.md
+++ b/README.md
@@ -213,9 +213,9 @@ assert state == [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
 > Keeps only the elements that satisfy a condition:
 
 ```python
-pair_integers: Stream[int] = integers.filter(lambda n: n % 2 == 0)
+even_integers: Stream[int] = integers.filter(lambda n: n % 2 == 0)
 
-assert list(pair_integers) == [0, 2, 4, 6, 8]
+assert list(even_integers) == [0, 2, 4, 6, 8]
 ```
 
 # `.throttle`
@@ -285,10 +285,10 @@ assert list(integers_by_parity_by_2) == [[0, 2], [1, 3], [4, 6], [5, 7], [8], [9
 ```python
 integers_by_parity: Stream[Tuple[str, List[int]]] = (
     integers
-    .groupby(lambda n: "odd" if n % 2 else "pair")
+    .groupby(lambda n: "odd" if n % 2 else "even")
 )
 
-assert list(integers_by_parity) == [("pair", [0, 2, 4, 6, 8]), ("odd", [1, 3, 5, 7, 9])]
+assert list(integers_by_parity) == [("even", [0, 2, 4, 6, 8]), ("odd", [1, 3, 5, 7, 9])]
 ```
 
 > [!TIP]
@@ -302,7 +302,7 @@ counts_by_parity: Stream[Tuple[str, int]] = (
     .map(star(lambda parity, ints: (parity, len(ints))))
 )
 
-assert list(counts_by_parity) == [("pair", 5), ("odd", 5)]
+assert list(counts_by_parity) == [("even", 5), ("odd", 5)]
 ```
 
 # `.flatten`
@@ -310,9 +310,9 @@ assert list(counts_by_parity) == [("pair", 5), ("odd", 5)]
 > Ungroups elements assuming that they are `Iterable`s:
 
 ```python
-pair_then_odd_integers: Stream[int] = integers_by_parity.flatten()
+even_then_odd_integers: Stream[int] = integers_by_parity.flatten()
 
-assert list(pair_then_odd_integers) == [0, 2, 4, 6, 8, 1, 3, 5, 7, 9]
+assert list(even_then_odd_integers) == [0, 2, 4, 6, 8, 1, 3, 5, 7, 9]
 ```
 
 ### thread-based concurrency
diff --git a/tests/test_readme.py b/tests/test_readme.py
index 9c7736c..aa69fe8 100644
--- a/tests/test_readme.py
+++ b/tests/test_readme.py
@@ -97,9 +97,9 @@ def test_foreach_example(self) -> None:
         assert state == [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
 
     def test_filter_example(self) -> None:
-        pair_integers: Stream[int] = integers.filter(lambda n: n % 2 == 0)
+        even_integers: Stream[int] = integers.filter(lambda n: n % 2 == 0)
 
-        assert list(pair_integers) == [0, 2, 4, 6, 8]
+        assert list(even_integers) == [0, 2, 4, 6, 8]
 
     def test_throttle_example(self) -> None:
 
@@ -152,10 +152,10 @@ def test_group_example(self) -> None:
     def test_groupby_example(self) -> None:
         integers_by_parity: Stream[Tuple[str, List[int]]] = (
             integers
-            .groupby(lambda n: "odd" if n % 2 else "pair")
+            .groupby(lambda n: "odd" if n % 2 else "even")
         )
 
-        assert list(integers_by_parity) == [("pair", [0, 2, 4, 6, 8]), ("odd", [1, 3, 5, 7, 9])]
+        assert list(integers_by_parity) == [("even", [0, 2, 4, 6, 8]), ("odd", [1, 3, 5, 7, 9])]
 
         from streamable import star
 
@@ -164,13 +164,13 @@ def test_groupby_example(self) -> None:
             .map(star(lambda parity, ints: (parity, len(ints))))
         )
 
-        assert list(counts_by_parity) == [("pair", 5), ("odd", 5)]
+        assert list(counts_by_parity) == [("even", 5), ("odd", 5)]
 
     def test_flatten_example(self) -> None:
         global integers_by_parity
-        pair_then_odd_integers: Stream[int] = integers_by_parity.flatten()
+        even_then_odd_integers: Stream[int] = integers_by_parity.flatten()
 
-        assert list(pair_then_odd_integers) == [0, 2, 4, 6, 8, 1, 3, 5, 7, 9]
+        assert list(even_then_odd_integers) == [0, 2, 4, 6, 8, 1, 3, 5, 7, 9]
 
         mixed_ones_and_zeros: Stream[int] = (
             Stream([[0] * 4, [1] * 4])
diff --git a/tests/test_stream.py b/tests/test_stream.py
index 2716681..8771308 100644
--- a/tests/test_stream.py
+++ b/tests/test_stream.py
@@ -117,7 +117,7 @@ class TestError(Exception):
 
 src = range(N)
 
-pair_src = range(0, N, 2)
+even_src = range(0, N, 2)
 
 
 def randomly_slowed(
@@ -570,7 +570,7 @@ def test_map_or_foreach_with_exception(
             list(
                 method(Stream(src), throw_for_odd_func(raised_exc), concurrency).catch(catched_exc)  # type: ignore
             ),
-            list(pair_src),
+            list(even_src),
             msg="At any concurrency, `map` and `foreach` and `amap` must not stop after one exception occured.",
         )
 
@@ -1010,7 +1010,7 @@ def f(i):
                     ),
                 )
             ),
-            list(map(lambda e: [e, e + 1], pair_src)),
+            list(map(lambda e: [e, e + 1], even_src)),
             msg="`group` should yield upstream elements in a two-element group if `interval` inferior to twice the upstream yield period",
         )