American Heritage Dictionary
(3)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
People with cable or satellite TV service are used to near-instantaneous, flawless video content, which is difficult to stream reliably over a packet-switched network.— Techdirt
"It becomes a word-of-mouth network that is kind of instantaneous," he said.— PC World
His return to the road is instantaneous, his feet a speedy blur.— All articles at Blogcritics
The instantaneous, abbreviated nature of the medium makes this a tough act to pull off; you'll usually just come off sounding credulous and reactionary.— Manifest Density
With DroboPro expansion is automatic and instantaneous, and

American Heritage Dictionary (1)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a month.
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