• What it means:

It is vital to get across the meaning of the item clearly and to ensure that your students have understood correctly with checking questions.
• The form:
Studens need to know if it is a verb/a noun/an adjective etc to be able to use it effectively.
• How it is pronounced
This can be particularly problematic for learners of English because there is often no clear relation between how a word is written and how it is pronounced. is very important to use the phonemic script in such cases so the sts have a clear written record of the pronunciation. Don't forget also to drill words that you think will cause pronunciation problems for your students and highlight the word stresses.
• How it is spelt:
This is always difficult in English for the reason mentioned above. Remember to clarify the pronunciation before showing the written form.
• If it follows any unpredictable grammatical patterns
For example, man-men / information (uncountable) and if the word is followed by a particular preposition (e.g. depend on )
• The connotations that the item may have
Bachelor is a neutral/positive word whereas spinster conjures a more negative image.
• The situations when the word is or is not used
Is it formal/neutral/informal?For example, spectacles/glasses/specs. Is it used mainly in speech or in writing? To sum up is usually written whereas mind you is spoken. Is it outdated? Wireless instead of radio.
• How the word is related to others
For example, synonyms, antonyms, lexical sets
• Collocation or the way that words occur together
You describe things 'in great detail' not 'in big detail' and to ask a question you 'raise your hand' you don't 'lift your hand'. It is important to highlight this to students to prevent mistakes in usage later.
• What the affixes (the prefixes and suffixes) may indicate about the meaning
For example, substandard sub meaning under. This is particularly useful at a higher level.
Which of these areas you choose to highlight will depend on the item you are teaching and the level of your students. Now it's time to think about how we can get the meaning across.

With hundreds of thousands of words in the English language, teaching vocabulary can seem like a very daunting prospect. Remember though that the average native speaker uses around only five thousand words in everyday speech. Moreover, your students won't need to produce every word they learn, some they will just need to recognize. Selecting what to teach, based on frequency and usefulness to the needs of your particular students is therefore essential. Once you have chosen what to teach, the next important steps are to consider what students need to know about the items, and how you can teach them.