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If a sound is voiceless (or 'unvoiced'), the vocal cords are not vibrating or producing a noise.
Also called lead-in or starter. It is theintroductory stage of a lesson - usually an introduction to the topic and/or target language of the lesson you are about to give.
See open questions.
It is a group of related words that all have the same root (or 'base form') - e.g., happiness, happy, unhappy,happily.
See main stress.