Means the absence of any other essential oils that can blend, stretch, dilute or extend the oil (i.e. Lavender extended with Lavandins). Pure essential oil is just that - it is pure - and unadulterated.
There have been no synthetic materials added. Organic means absence of synthetic esters, emulsifying agents (Tween, Octoxynol-1) and petroleum based dilutants such as mineral oil. There are no toxic chemicals added.
The oil has not been tampered with. No decolorizing, recolorizing or deterpenization. Complete means essences are not decolorized, recolored, or deterpenated. Deterpenating results in lower bioactivity (Thyme becomes more toxic, Lavender has catalyst values taken away.)