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isomorphism

Abstract algebra: Take a group G, and a group H, with a group operation *. G is isomorphic to H if there exist a map f: G->H such that:

1: f is injective
2: f is surjective
3: f(a*b)=f(a)*f(b) for all a,b in G

If f satisfies these three properties, f is called an isomorphism.
The map f: Z -> E given by f(a)=2a where Z is the integers and E is the even integers is an isomorphism.

Proof:
Showing injectivity

f(b)=f(a) => 2a=2b (from the given function) <=> a=b

Showing surjectivity
Suppose n is in E. n is an even integer hence n=2k for some integer k.

f(k)=2k=n, hence f is surjective.

Homomorphism:
f(a+b)=2(a+b)=2a+2b=f(a)+f(b)

Hence f is an isomorphism. Q. E. D.
isomorphism by qsqazxcvfrew March 29, 2018
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ihome by HeavyMetalRocks January 6, 2015

Isomorphic JavaScript 

A JavaScript application which can be executed in both a browser and a non-browser runtime. This was the first term used to describe this concept, but "Universal JavaScript" now has wider acceptance. Mathematicians and functional programmers will scoff at you if you use "isomorphic" to describe JavaScript, so save face by using "universal" instead.
You aren't writing isomorphic JavaScript? Ha, you remind me of my old Java coworkers.
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ioMoVo by ioMoVo March 9, 2022
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(Two friends sitting on the same couch playing 'Words with Friends'...whilst a third friend sits in between, only with his primitive 'button phone' to keep him entertained)

Friend 1 (iPhone): Bullshit, there's no way what you just sent is a word, you made that up!....(enters a reply word to Friend 2). Suck on this fgt!

Friend 2 (iPhone): Haha you idiot, you're guessing this shit as much as I am!

Friend 3 (Non-iPhone): -_- (wondering wtf is going on) ...man I got some serious iFomo.
iFomo by markbar May 3, 2011