The key word: sole. One might become enlightened or experience altered states as a result, but this is a by-product, not the purpose. A lot of meditation, as discussed in AA, is about learning breathing or other techniques adopted from Eastern religions. The local Buddhist centre is usually teeming with AAs learning how to meditate.
This is, of course, meditation, according to the modern dictionary definition of it. It is not strictly Step Eleven, however, although it may support it immensely, in the same way that making tea at a meeting is the practice of Step Twelve per se but does help make Step Twelve work possible.
Here's Dr Bob's take:
'Prayer, of course, was an important part of Dr Bob's faith. According to Paul S., "Dr Bob's morning devotion consisted of a short prayer, a 20-minute study of a familiar verse from the Bible, and a quiet period of waiting for directions as to where he, that day, should find use for his talent. Having heard, he would religiously go about his Father's business, as he put it." ' (Dr Bob and the Good Oldtimers, p. 314)