coinstantaneous

As adjectives the difference between synchronous and coinstantaneous

is that synchronous is at the same time, at the same frequency while coinstantaneous is happening at the same instant.

As adjectives the difference between coinstantaneous and simultaneous

is that coinstantaneous is happening at the same instant while simultaneous is occurring]] or [[transpire|transpiring at the same time.

As a noun terms

is .

As an adjective coinstantaneous is

happening at the same instant.

As adjectives the difference between instant and coinstantaneous

is that instant is (dated) impending; imminent while coinstantaneous is happening at the same instant.

As a noun instant

is a very short period of time; a moment.

As an adverb instant

is (poetic) at once; immediately.