Repeat, Repeat, Repeat
Spaced repetition – once introduced, keep using the vocab so learners become familiar with it – review new vocabulary at the end of each lesson and the beginning of the next. Encourage the use of flashcards and/or apps like Quizlet and Brainscape for repetition between lessons. Typically, a word needs to be used 14 times before it is considered ‘learned’.
Teach in Context
Learners need to have somewhere to ‘put’ new vocabulary., if it is taught in context, studies have shown that they are more likely to retain it than words in isolation. Context also helps with comprehension of new vocabulary. So, if it is not relevant to the lesson – don’t introduce it yet!.
Learners need to understand 95% (Laufer) of a text to make it enjoyable and comprehensible. Reading is an excellent way to be introduced to new vocabulary in context. Try graded readers, newspapers, magazines, internet articles – anything that interests the learner (sport, music, film reviews or even whole novels).
Teach Word Formations
Introduce learners to the different affixes that, using the same word stem, give a different meaning. With a knowledge of these prefixes & suffixes, learners can rapidly increase their working vocabulary. A little basic morphology and learners can create word families of verbs, nouns, adjectives and adverbs all from one word.
Chunks and Collocations
Words are rarely used in isolation – teach your learners which words are commonly used together. Verbs and nouns together aid fluency. Knowing the function of a word (in action) makes it easier to understand and remember. Use Corpus based dictionaries and sites for practical examples like BNC/BYU and Just-the-Word.
Encourage learners to create lexical sets when learning new vocabulary. Include synonyms and antonyms and anything relevant. Writing words as a ‘web’ can make the words more memorable and connections and relationships between words easier to see than in a standard list. For an excellent example see vocabulary maps.