amplitude

plural amplitudes

1. countableuncountableThe measure of the size of something, especially its width or breadth; largeness, magnitude.

   amplitude of mind

   1671, John Milton, “The First Book”, in Paradise Regain’d. A Poem. In IV Books. To which is Added, Samson Agonistes, London: […] J[ohn] M[acock] for John Starkey […], →OCLC, page 2

   3 more examples

   The cathedral of Lincoln […] is a magnificent structure, proportionable to the amplitude of the diocese.

   1655, Thomas Fuller, The Church-history of Britain; […], London: […] Iohn Williams […], →OCLC, (please specify |book=I to XI)

   amplitude of comprehension

   1849–1861, Thomas Babington Macaulay, The History of England from the Accession of James the Second, volume (please specify |volume=I to V), London: Longman, Brown, Green, and Longmans, →OCLC

   As the two topped the ridge there burst on them the strong scarlet light of a red-curtained English inn. It stood sideways in the road, as if standing aside in the amplitude of hospitality.

   1911, G. K. Chesterton, The Innocence of Father Brown

2. countableuncountablemathematicsThe maximum absolute value of the vertical component of a curve or function, especially one that is periodic.
3. countableuncountablenatural sciencesThe maximum absolute value of some quantity that varies.
4. countableuncountableastronomyThe arc of the horizon between the true east or west point and the center of the sun, or a star, at its rising or setting. At the rising, the amplitude is eastern or ortive: at the setting, it is western, occiduous, or occasive. It is also northern or southern, when north or south of the equator.
5. countableuncountableastronomyThe arc of the horizon between the true east or west point and the foot of the vertical circle passing through any star or object.
6. countableuncountableengineeringThe horizontal line which measures the distance to which a projectile is thrown; the range.
7. countableuncountablegymnasticsThe range of motion of the gymnast's body while performing a skill.
8. countableuncountablebiologyThe range of environmental conditions in which an organism can survive.