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As an interval region, the unison usually refers precisely to the 0-cent interval. However, there can be a tiny difference between any two intervals that are practically "the same note" (more pedantically, an ~~extremely small~~ [[~~Unnoticeable~~ comma|comma]]), that might be considered a "unison" (or at least too small to be a meaningful interval). This range usually goes up to 3.5 cents, as that is the just-noticeable difference.

As an interval region, the unison usually refers precisely to the 0-cent interval. However, there can be a tiny difference between any two intervals that are practically "the same note" (more pedantically, an [[unnoticeable comma|extremely small comma]]), that might be considered a "unison" (or at least too small to be a meaningful interval). This range usually goes up to 3.5 cents, as that is the [[just-noticeable difference]].

In some practices, this bound goes up to about 6 cents, which is the most precisely one is expected to intonate a pitch on certain instruments, and is a bit smaller than a [[Kleisma (interval region)|kleisma]] (hence the kleisma's significance in the context of intonation).

In some practices, this bound goes up to about 6 cents, which is the most precisely one is expected to intonate a pitch on certain instruments, and is a bit smaller than a [[Kleisma #As an interval region|kleisma]] (hence the kleisma's significance in the context of intonation).

As a diatonic interval category, unisons represent [[subchromatic]] motions – i.e. the difference between a note and itself (though perhaps in a different tuning or using a non-diatonic accidental, though that's more generally covered by [[comma and diesis]]). Every note in every scale has a unison, which is that note itself.

As a diatonic interval category, unisons represent [[subchromatic]] motions – i.e. the difference between a note and itself (though perhaps in a different tuning or using a non-diatonic accidental, though that is more generally covered by [[comma and diesis]]). Every note in every scale has a unison, which is that note itself.

In functional harmony, the unison over the root serves as the [[tonic]].

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 {{Wikipedia|Unison}}
-As an interval region, the unison usually refers precisely to the 0-cent interval. However, there can be a tiny difference between any two intervals that are practically "the same note" (more pedantically, an extremely small [[Unnoticeable comma|comma]]), that might be considered a "unison" (or at least too small to be a meaningful interval). This range usually goes up to 3.5 cents, as that is the just-noticeable difference.
+As an interval region, the unison usually refers precisely to the 0-cent interval. However, there can be a tiny difference between any two intervals that are practically "the same note" (more pedantically, an [[unnoticeable comma|extremely small comma]]), that might be considered a "unison" (or at least too small to be a meaningful interval). This range usually goes up to 3.5 cents, as that is the [[just-noticeable difference]].
-In some practices, this bound goes up to about 6 cents, which is the most precisely one is expected to intonate a pitch on certain instruments, and is a bit smaller than a [[Kleisma (interval region)|kleisma]] (hence the kleisma's significance in the context of intonation).
+In some practices, this bound goes up to about 6 cents, which is the most precisely one is expected to intonate a pitch on certain instruments, and is a bit smaller than a [[Kleisma #As an interval region|kleisma]] (hence the kleisma's significance in the context of intonation).
-As a diatonic interval category, unisons represent [[subchromatic]] motions – i.e. the difference between a note and itself (though perhaps in a different tuning or using a non-diatonic accidental, though that's more generally covered by [[comma and diesis]]). Every note in every scale has a unison, which is that note itself.
+As a diatonic interval category, unisons represent [[subchromatic]] motions – i.e. the difference between a note and itself (though perhaps in a different tuning or using a non-diatonic accidental, though that is more generally covered by [[comma and diesis]]). Every note in every scale has a unison, which is that note itself.
 In functional harmony, the unison over the root serves as the [[tonic]].