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| Color name = w1, wa unison

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The '''unison''' (interval ratio '''1/1''') is the [[interval]] between two tones that are identical in pitch. In the [[harmonic series]], 1/1 is the 1st [[harmonic]], and likewise in the [[subharmonic series]] 1/1 is the first [[subharmonic]] – this is because it acts as the fundamental to both series.

Measured in [[cent]]s (or any other logarithmic measure such as [[2/1|octave]]s, [[edo|edosteps]], etc.), the unison's size is exactly 0. This is because the distance between two identical pitches is zero. As such, the unison can be considered as a degenerate interval.

In [[just intonation]], 1/1 represents the base frequency from which an interval is measured.

== As an interval region ==

{{Infobox interval region

| Name=Unison

| Name = Unison

| Cents lower=0

| Cents lower = 0

| Cents upper=0

| Cents upper = 0

| Cents upper wide=6

| Cents upper wide = 6

| JI intervals=1/1

| JI intervals = 1/1

| Complement=[[Octave]]

| Complement = [[Octave]]

| Lower region=

| Lower region =

| Higher region=[[Comma and diesis]]

| Higher region = [[Comma and diesis]]

}}

The '''unison''' (interval ratio '''1/1''') is the [[interval]] between two tones that are identical in pitch. In the [[harmonic series]], 1/1 is the 1st [[harmonic]], and likewise in the [[subharmonic series]] 1/1 is the first [[subharmonic]]- this is because it acts as the fundamental to both series.

~~Measured in [[~~cent~~]]s~~ (~~or any other logarithmic measure such as [[millioctave]]s~~, [[~~EDO~~]] ~~steps, etc.~~), ~~the~~ unison~~'s size is exactly 0~~. This ~~is because the distance between two identical pitches is zero~~. ~~As such~~, the ~~unison can be considered as a degenerate interval~~.

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.

In [[~~just intonation~~]]~~, 1/1 represents~~ the ~~base frequency from which an interval is measured~~.

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).

~~The unison may also be treated as an~~ interval ~~region with~~ a ~~width of 0 cents corresponding to exactly the interval 1/1~~.

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.

~~== Unison (interval region) ==~~

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

''[[~~:Category:Todo:complete section|Todo: Complete section.~~]]~~'' {{todo|complete section}}~~

== See also ==

* [[Fundamental]]

* [[Tonic]]

* [[Octave]]

* [[Octave reduction]]

[[Category:Unison| ]]

~~{{Wikipedia|Unison}}~~

[[Category:1-odd-limit]]

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 | Color name = w1, wa unison
 }}
+The '''unison''' (interval ratio '''1/1''') is the [[interval]] between two tones that are identical in pitch. In the [[harmonic series]], 1/1 is the 1st [[harmonic]], and likewise in the [[subharmonic series]] 1/1 is the first [[subharmonic]] – this is because it acts as the fundamental to both series.
+Measured in [[cent]]s (or any other logarithmic measure such as [[2/1|octave]]s, [[edo|edosteps]], etc.), the unison's size is exactly 0. This is because the distance between two identical pitches is zero. As such, the unison can be considered as a degenerate interval.
+In [[just intonation]], 1/1 represents the base frequency from which an interval is measured.
+== As an interval region ==
+{{Todo|complete section}}
 {{Infobox interval region
-| Name=Unison
+| Name = Unison
-| Cents lower=0
+| Cents lower = 0
-| Cents upper=0
+| Cents upper = 0
-| Cents upper wide=6
+| Cents upper wide = 6
-| JI intervals=1/1
+| JI intervals = 1/1
-| Complement=[[Octave]]
+| Complement = [[Octave]]
-| Lower region=
+| Lower region =
-| Higher region=[[Comma&nbsp;and&nbsp;diesis]]
+| Higher region = [[Comma&nbsp;and&nbsp;diesis]]
 }}
-The '''unison''' (interval ratio '''1/1''') is the [[interval]] between two tones that are identical in pitch. In the [[harmonic series]], 1/1 is the 1st [[harmonic]], and likewise in the [[subharmonic series]] 1/1 is the first [[subharmonic]]- this is because it acts as the fundamental to both series.
+{{Wikipedia|Unison}}
-Measured in [[cent]]s (or any other logarithmic measure such as [[millioctave]]s, [[EDO]] steps, etc.), the unison's size is exactly 0. This is because the distance between two identical pitches is zero. As such, the unison can be considered as a degenerate interval.
+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.
-In [[just intonation]], 1/1 represents the base frequency from which an interval is measured.
+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).
-The unison may also be treated as an interval region with a width of 0 cents corresponding to exactly the interval 1/1.
+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.
-== Unison (interval region) ==
+In functional harmony, the unison over the root serves as the [[tonic]].
-''[[:Category:Todo:complete section|Todo: Complete section.]]'' {{todo|complete section}}
 == See also ==
 * [[Fundamental]]
-* [[Tonic]]
-* [[Octave]]
 * [[Octave reduction]]
 [[Category:Unison| ]]<!-- main article -->
-{{Wikipedia|Unison}}
 [[Category:1-odd-limit]]