TMI

1. 1
   nouncolloquialuncountableinitialism

   Initialism of too much information.

   When he started describing his medical symptoms over dinner, someone finally muttered TMI.

   Her post about the breakup was pure TMI, and half her followers cringed.

   Note

   The retort for an overshare works in three grammatical slots. Shouted alone, it is an interjection (I told him, TMI!). As a mass noun it can be offered, as in Nicholas Kristof's 2024 "propensity for offering TMI." Before a noun it acts like an adjective, as in Pamela Paul's "a T.M.I. Facebook confessional." Alex Beam, writing in 2008, still pinned it on "the youthful txters." Keep it out of formal prose.

2. 2
   proper nouninitialism

   Initialism of Three Mile Island.

   The documentary traced the cleanup at TMI over the following decade.

   Engineers still study what went wrong at TMI in 1979.

   Note

   One name covers three referents. TMI can mean the island in the Susquehanna River, the nuclear plant built on it, or the 1979 partial meltdown in that plant's unit 2 reactor, and context decides which. The full name has even become an informal yardstick for nuclear disasters. New Hampshire has a Three Mile Island of its own, on Lake Winnipesaukee.

3. 3
   noununcountableinitialism

   Initialism of transmarginal inhibition.

   Pavlov's later experiments centered on TMI in dogs exposed to overwhelming stimuli.

   Researchers cited TMI to explain the shutdown response under extreme overload.

   Note

   A term from psychology for what happens when stimulation overwhelms an organism. Past a certain threshold, responsiveness shuts down instead of rising. Pavlov described this as a protective state. "Transmarginal" points to that threshold: the inhibition sets in beyond the margin of tolerable input. The initialism belongs to specialist writing, and general prose is clearer with the full term.

4. 4
   noununcountableinitialism

   Initialism of trimethylindium.

   The deposition process relies on TMI as its indium precursor.

   TMI ignites on contact with air, so it is stored under inert gas.

   Note

   A chemist's shorthand for the organometallic compound (CH₃)₃In. It serves as the indium source in vapor-phase epitaxy, where semiconductor makers chase purity levels of 99.99999%. In a paper on deposition, it is read letter by letter like any lab initialism. Outside that setting, readers will hear the "too much information" retort first, so spell out trimethylindium at first mention.

5. 5
   nouncountable or uncountableinitialism

   Initialism of trans-Mars injection.

   Mission control confirmed a successful TMI shortly after launch.

   The spacecraft coasted toward Mars for months following TMI.

   Note

   A burn, not a trajectory: the letters name the rocket firing that moves a spacecraft from its local orbit onto a Mars transfer orbit. That transfer orbit is a path around the Sun that will intercept the planet. Mission reports therefore speak of performing or confirming TMI as an event. The months of coasting that follow are the transfer, not the injection.

6. 6
   noununcountableinitialism

   Initialism of Temperature, Magenta/Green levels, and Intensity.

   The colorist nudged TMI to balance the daylight scene.

   Correcting the footage started with a quick pass over TMI.

   Note

   Three grouped controls hide behind the letters: color temperature, the magenta–green balance that corrects a tint, and overall intensity. Because the initialism names the set rather than a single value, colorists treat it as one thing to adjust or balance. The M marks an axis running between two colors, not magenta alone.

Showing meanings only. Show all 6