Persistent application or diligence; unflagging effort.(noun)
Constant personal attention and often obsequious solicitude. Often used in the plural.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "assiduity" in a sentence
"The motive of this assiduity was at length revealed to me, by a violent and fervent declaration of love, which astonished and perplexed me."
"Or maybe a nap first, since I honestly have no clue if I used "assiduity" properly above, a sure sign that I'm tired....."
"Their battalions practised skirmishing on the glacis with that routine assiduity which is the secret of the German military success."