I love dictionaries. Don't ask.
Assume you'll need to buy a couple over the course of a child's schooling. For the first one, buy the most attractively illustrated one you can find. You may be able to use some in your local library? In the early days, it's mainly to get the child used to the idea that some books exist to define and explain words and some of those words may be unfamiliar. Oxford, Usborne and DK all produce suitable volumes.
You will need to upgrade as soon as your child comes across an unfamiliar word that your dictionary doesn't define adequately. Ones that make it easy to see at a glance where you are in the alphabet are helpful (e.g. those that show the letter you're on enlarged as part of a whole alphabet shown along a page margin, or those that have a thumb index by letter).
By year 4 or 5, a good reader will definitely benefit from access to a much larger and more serious adult dictionary (or an online equivalent).
<soapbox>And - completely off-topic, but while I'm at it - there's no advantage whatsoever to a child being able to recite the alphabet until they get to the point where they need to use a paper dictionary. Parents who think the ability to recite a sing song alphabet at three is a sign of genius are mistaken.
Just as any teacher will confirm that the ability to recite more or less sequential numbers in a sing song voice has little or nothing to do with understanding number and being able to count lots of objects that aren't sitting in a tidy line. </soapbox>
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