You need to look at the chord in the context of the other chords around it or you really can't determine what chord it is..this is particularly true of more complex jazzy chords.
Another example, more simple for emphasis:
What chord is CEG? Most of you right now are saying "C major," right? That's one possibility, but:
- It can also be an am7 with no root (root omission [and 5th omission, while we're on the topic] is very common when you're chunking out jazz chords w/a big band.)
- If the chord behind it is an e minor chord, you could consider CEG an e minor chord with the 6 being used for color/voice leading, although this would be an unusual usage.
OPs chord might be a lydian chord with the maj. 7 omitted. More info on that: http://en.wikipedia.org/wiki/Lydian_chord