[ 'ʌɪδə , 'i:- ]
■ conjunction & adverb
1》 used before the first of two (or occasionally more) alternatives specified (the other being introduced by ‘or’).
2》 [ adverb , with negative ] used to indicate a similarity or link with a statement just made.
↘moreover.
■ determiner & pronoun one or the other of two people or things.
↘each of two.
Origin
OE gther , contracted form of g(e)hwæther , of Gmc origin; ult. related to aye 2 and whether .
Usage
In good English, it is important that ~ and or are correctly placed so that the structures following each word balance and mirror each other. Thus, sentences such as ~ I accompany you or I wait here and I'm going to buy ~ a new camera or a new video are correct, whereas sentences such as ~ I accompany you or John and I'm ~ going to buy a new camera or a video are not well balanced.