Thanks for your thoughtful review.

natatime_sliding

Sounds like OAPs complaining that their tea'n'chat session are getting later and later .... :) But yes, it's too long.

mapAdj

Map adjacent; map adjoining; map adjunct; all of those work.

Since salva pointed out the scala version, I keep looking again at slide/sliding; but they make me think of sliding scales & sliding checksum, neither of which are appropriate here.

As I said elsewhere, many function names (and keywords) do not mean much unless you know what they mean in the context of a computer program.

Take reduce or join or grep or splice. Write the functionality of any of those out in full:

take_a_list_of_values_convert_them_to_their_string_representations_if_
+necessary_intersperse_them_with_this_other_string_and_return_a_single
+_string_formed_from_them_all( "\t", @nums);
[download]

And it would be ridiculous.

You only know what grep does, because you learnt it, not from the name, so the key things are to be vaguely mnemonic and memorable, and preferably short.

I'm more and more persuaded by overlap & overmap.