Every Yankees offseason feels momentous, because they’re the Yankees and, in their universe, big names constantly must be replaced, retained or pursued.

This Bronx Hot Stove round possesses a vibe quite unlike any other, however. Remember the “Seinfeld” episode that introduced Year 2000 celebrations known as the Newmanium and the Kramennium?

Welcome to the Cashmanium.

Brian Cashman is entering his 18th season as the Yankees general manager. In my estimation, this 2014-15 revamp sports his fingerprints more than all of its predecessors.

Cashman, in an interview Friday, didn’t agree with my assessment.

“We’re just trying to improve ourselves and get better,” he said. “Every move is designed to that purpose.”

However, he added, “We’re trying to plot a new road to another championship. I think we’re more diverse and have more flexibility.”

And those are trademarks of what Cashman has tried to accomplish, particularly since he took full control of the Yankees’ baseball operations following the 2005 season.

As we all know, plenty of moves fizzled and the team’s farm system hit a very rough patch, and that’s why the Yankees enter 2015 having missed the playoffs in two consecutive completed seasons for the first time since 1992-93.

Then again, not a single team of baseball’s 30 has enjoyed a seamless run in the past nine years. Even the Dodgers have learned in the prior two seasons that moving on up to the Yankees’ payroll neighborhood doesn’t guarantee you a parade. They’re trying a new road, too, this winter, bringing over Andrew Friedman from the Rays to run their show.

The Yankees’ reputation as big-game hunters can be overstated. They spent huge following 2008 (A.J. Burnett, CC Sabathia and Mark Teixeira) and 2013 (Carlos Beltran, Jacoby Ellsbury, Brian McCann and Masahiro Tanaka), both times after missing the playoffs and both times with massive dollars coming off their books.

Their books didn’t enjoy such relief this winter, especially not with Alex Rodriguez ($21 million, plus a $6 million bonus if he hits six home runs) returning to the payroll following his 2014 suspension, so that’s why Jon Lester and the still-free Max Scherzer and James Shields haven’t been serious considerations.

Because there isn’t as much money to spend in Yankees Land, and because the Core Four, all of whom reached ownership’s radar regarding contract negotiations, are all retired now, the result of this winter’s efforts looks more like a baseball team than a TV show.

These are GM-level moves, following the course (of a relatively static payroll) set by managing general partner Hal Steinbrenner.

That, of course, doesn’t mean it will work, and for sure, there are industry folks who wonder if Didi Gregorius can hit enough to support his defense, and whether respected Yankees pitching coach Larry Rothschild can turn the hard-throwing Nathan Eovaldi into an asset in an American League starting rotation.

Yet this plan has been bold, intriguing and — given the Yankees’ history of what Post colleague Joel Sherman referred to last year as “a caveman way to build a roster” — refreshing.

So far, since the completion of the 2014 season, the Yankees have completed six trades in which they gave up six players (Manny Banuelos, Francisco Cervelli, Shane Greene, Shawn Kelley, David Phelps and Martin Prado) and received nine (Johnny Barbato, David Carpenter, Eovaldi, Domingo German, Gonzalez Germen, Gregorius, Garrett Jones, Chasen Shreve and Justin Wilson).

They also picked up a compensation draft pick and $10 million in spending room when they pulled off the de facto trade of letting free agent David Robertson (who rejected a qualifying offer) go to the White Sox for $46 million over four years and signing reliever Andrew Miller for $36 million over the same time period.

Last offseason, amid their massive free-agent signings, the Yankees totaled three trades in which they gave up two players (David Huff and Chris Stewart) and received one (Dean Anna). In the 2012-13 Hot Stove period, the Yankees made exactly zero trades. (Thanks to MLB.com for its transactions database.)

From Cashman’s vantage point, his front office’s process hasn’t transformed. It is his inventory that has improved and therefore changed the optics.

“The public, they don’t see the efforts of the deals that don’t come through,” he said. “Our system just got closer [to producing major leaguers]. We’ve got guys closing the gap. This winter, we’ve made some moves because we have some younger players, controllable players, who are moveable pieces.”

For instance, Cashman said, the Yankees signed Brian Roberts and Kelly Johnson to one-year deals last year, and Kevin Youkilis to a one-year deal for 2013 — three gambits that were busts — only after trade ideas for other players didn’t come through.

We aren’t accustomed to seeing the Yankees swap major league guys without obvious replacements already in place.

That is what they did with Greene and Prado, though. Eovaldi came aboard two weeks after Greene left — the Yankees also have lost Hiroki Kuroda and Brandon McCarthy from their 2014 starting rotation — while this past week, Stephen Drew agreed to a one-year, $5 million deal to try to resurrect his career as the Yankees’ second baseman, an assignment that would blow up the proposed Jose Pirela-Rob Refsnyder platoon at second base before it ever began.

It has been fluid, and we all can see that the Yankees hardly look like a certain playoff team even after their considerable retooling has given them a high-end bullpen, better defense and a lefty-heavy lineup in an AL East that no longer employs any elite southpaw pitchers.

They are banking heavily on good health from Tanaka, Michael Pineda and CC Sabathia, and on rebounds from Beltran, McCann and Mark Teixeira.

They are letting A-Rod report to spring training with the knowledge that he easily could produce more off-field ugliness than on-field value.

Nevertheless, the Cashmanium continues. He will keep looking for upgrades, albeit not at the highest budget level, and it won’t stop even when the season begins.

Last July’s acquisitions of Drew, Prado and Chase Headley, whom the Yankees re-signed as a free agent, jump-started this movement and also secured another contract for Cashman.

“I’m glad I still have this opportunity,” Cashman said. “I look forward to taking it 110 percent seriously and giving it our best shot as we move forward, as we try to move to another championship. As soon as this year.

“The proof will be when the dust settles,” he said.

Right now, it’s at least interesting to see some novel particles of dust emerging from Yankee Stadium.