Record-breaking

adj.joyful, energeticeveryday

What it means

Surpassing the best result that had previously been officially recorded.

Reach for it when celebrating a verified new high in performance, scale, or speed

A record-breaking turnout filled every volunteer shift before noon.

playful
best-ever
when a plain informal superlative suits the audience
not when Best-ever can reflect opinion unless the measure is specified.
everyday
historic
when lasting significance matters more than a numerical best
not when A historic event may be important without breaking any record.
professional
all-time high
when the measured peak itself should be named
not when All-time high is a noun phrase for the level, not a general adjective for the event.
professional
chart-topping
when rank on a published music or sales chart is meant
not when Chart-topping is limited to ranked popularity, not every measurable achievement.
formal
landmark
when the achievement marks an important stage
not when Landmark praises importance rather than exceeding a prior maximum.
formal
unprecedented
when nothing comparable is known to have happened before
not when Unprecedented does not require a measured record and can be used too loosely.

record-breaking performance
The record-breaking performance combined fast pacing with flawless exchanges.
record-breaking year
A record-breaking year brought the food bank more donors and more requests.
record-breaking number
A record-breaking number of residents voted in the neighborhood election.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.