never surpassed or greater:
Production will reach an all-time high.
regarded as such in its entire history:
an all-time favorite song.
Contemporary Examples

Washington is aware that the U.S. reputation today in Pakistan is at an all-time low.
Pakistan’s Crucial Elections: There’s Much at Stake for the U.S. Shirin Tahir-Kheli May 9, 2013

At the moment, the relationship between the press and the police is at an all-time low.
Murdoch Journalists Thrown Under the Bus in Phone-Hacking Scandal Peter Jukes February 14, 2013

The Daily Beast surveys top historians to determine the all-time worst.
History’s 13 Most Hated Companies The Daily Beast June 21, 2010

Dykstra, meanwhile, has been named one of the 10 worst bosses of all-time and twice faced accusations of sexual harassment.
Charlie Sheen’s Crazy New BFF Randall Lane February 28, 2011

She is the active leader in career titles with 54 (10 more than sister Venus in 2nd) and 6th on the all-time majors list with 16.
The Battle of the Sexes Is Back: Serena vs. the Men Kevin Fixler August 27, 2013

Historical Examples

In 1980 tax revenues increased by $54 billion, and in 1980 we had one of our all-time biggest deficits.
Complete State of the Union Addresses from 1790 to 2006 Various

The Red River made an all-time record by flowing four miles an hour.
North Dakota Various

From this lofty outpost of the moor, if he stayed there, our all-time enemy certainly had a wide lookout.
England, Picturesque and Descriptive Joel Cook

The inflationary pressures on prices and rents, with relatively few exceptions, are now at an all-time peak.
State of the Union Addresses of Harry S. Truman Harry S. Truman

It is certain that the population of woodrats was high, if not at an all-time peak, in 1947.
Ecological Observations on the Woodrat, Neotoma floridana Henry S. Fitch

(prenominal) (informal) unsurpassed in some respect at a particular time: an all-time record at the Olympics

“during recorded time,” 1910, American English, from all + time (n.). Earlier it had been used in a sense “full-time,” of employment, or in opposition to one-time (1883).

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