Adjective

(en adjective)

Hard-working, diligent or regular (in attendance or work); industrious.

* 1831 , , The Surgeon's Daughter , ch. 2:

He was officious in the right time and place, quiet as a lamb when his patron seemed inclined to study or to muse, active and assiduous to assist or divert him whenever it seemed to be wished.

* 1880 , , Washington Square , ch. 33:

He died after three weeks' illness, during which Mrs. Penniman, as well as his daughter, had been assiduous at his bedside.

* 1917 , , "Bill the Bloodhound" in The Man With Two Left Feet and Other Stories :

A good deal of assiduous attention had enabled Henry to win this place in her affections.

* 2009 , Will Pavia , " Allen Klein, accountant turned manager of the Beatles, dies at 77," The Times (UK), 6 July:

Klein rose to prominence in the 1960s by assiduous application of accounting methods to the music industry.

Adjective

(en adjective)

Obstinately refusing to give up or let go.

She has had a persistent cough for weeks.

* {{quote-news

, year=2011 , date=November 10 , author=Jeremy Wilson , title= England Under 21 5 Iceland Under 21 0: match report , work=Telegraph citation , page= , passage=The most persistent tormentor was Alex Oxlade-Chamberlain, who scored a hat-trick in last month’s corresponding fixture in Iceland. His ability to run at defences is instantly striking, but it is his clever use of possession that has persuaded some shrewd judges that he is an even better prospect than Theo Walcott.}}

Insistently repetitive.

There was a persistent knocking on the door.

Indefinitely continuous.

There have been persistent rumours for years.

(botany) Lasting past maturity without falling off.

Pine cones have persistent scales.

*

The Jubulaceae have a leaf whose lobule, usually transformed into a water-sac, is normally very narrowly attached to the stem and to the dorsal lobe; indeed some Frullania'' taxa reproduce vegetatively by dropping the dorsal lobes, but not the lobules, and ''Neohattoria has caducous lobules but persistent lobes.

(computing) About some data or data structures: existing after the execution of the program. Remaining in existence past the lifetime of the program that creates it.

Once written to a disk file the data becomes persistent and it will still be there tomorrow when we run the next program.

This way transient value becomes persistent .

(mathematics) Describing a fractal process that has a positive Brown function

(mathematics, stochastic processes, of a state) non-transient.