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O
Objectives: The goals to be achieved.
Obstacles: Objects that are in the way.
Occipital bone: Convex protruding bone at the back of the skull.
Odour: Smell or fragrance.
One length cut: Hair cut in a 'bob'
Open centred pin curls: Loose, soft pin curls.
Open question: A question used to allow respondent to expand on their answer.
Organisms: A life form made of a complex system of cells and tissues.
Ornamentation: Decoration to be added to hair once it has been styled.
Outside shape: Shape of the hair cut on the base line.
Oval shape: The perfect shaped face to suit any hair style.
Overlap: Time of a treatment going into the time scheduled for another.
Oxidation: The addition of oxygen in a chemical reaction.
Oxymelanin: Melanin reduced by bleach.