Definition of "intonation"

She well knew the power of intonation, and thought that, in the absence of the curled lip, the contemptuous twitch of the nose, and the supercilious toss of the head, her message might be acceptable for Louisa's sake,...

1838 (date written), L[etitia] E[lizabeth] L[andon], chapter XVI, in Lady Anne Granard; or, Keeping up Appearances. […], volume I, London: Henry Colburn, […], published 1842, page 210

This additional cause of the intonation of thunder, together with the simile with which it is illustrated, is copied from our poet, both by Pliny, Nat. Hist. ii, 431, and Isidorus, Orig. xiii.

1805, Titus Lucretius Carus, The nature of things: a didactic poem

As when sulphureous fires, within the caves Of earth long pent, with intonation loud Burst through the riven rocks, and far as eye Can reach their furious devastation spread, So sudden, so resistless was the force Of this blasphemer's bold appeal to arms.

1808, Richard Cumberland, The Exodiad: A Poem, page 375

In anxious expectation stood the crowd, When the shrill clarion's intonation loud Gave notice that the challenger drew nigh.

1824, Sir James Bland Burges afterwards Lamb, The Dragon Knight: A Poem in Twelve Cantos, page 77

but Sir Hugh still exclaimed, —"Louder, old man, far louder!" till at last the minstrel, in obedience to his best and dearest friend, struck the harp with such violence, that not only did the strings break, but even the instrument itself burst asunder with a long melancholy intonation.

1825, Friedrich Heinrich Karl Freiherr de La Motte-Fouqué, The Magic Ring; a Romance, from the German, Etc, page 287