Definition of 'Fibonacci series'

World Environment Day 2019 is focusing on climate change, and more specifically air pollution, what causes it, and importantly, what we can do about it. Through a range of blogs and an in-depth look at current vocabulary on the topic, we highlight some of the words you may need to know to be able to take part in arguably one of the most important discussions of our time.

No books. No rote memorization. No chance of failure. Your chance to have a one-to-one lesson with best-selling language expert Paul Noble, try a FREE audio sample of his brand new Mandarin Chinese course.

Take a boat? Stay overnight somewhere? This article looks at some useful phrases you can use when discussing options about what to do when travelling.

Collocations are words that are often used together and are brilliant at providing natural sounding language for your speech and writing.

Our new online dictionaries for schools provide a safe and appropriate environment for children. And best of all it's ad free, so sign up now and start using at home or in the classroom.

We have almost 200 lists of words from topics as varied as types of butterflies, jackets, currencies, vegetables and knots! Amaze your friends with your new-found knowledge!

All the latest wordy news, linguistic insights, offers and competitions every month.

Updated with all the very latest new words and senses, this new 13th edition is an unparalleled resource for word lovers, word gamers, and word geeks everywhere. #homeoflivingenglish