One of an imaginary people, a small variety of the human race, that gave themselves this name (meaning ‘hole-dweller’) but were called by others halflings, since they were half the height of normal Men. (p. 569)
The present entry in the OED reads: "a member of an imaginary race of small people." It would be quite reasonable at this point to object that "imaginary people" don't necessarily inhabit an imaginary place or time period. True enough. But the others mentioned, those who call Hobbits "halflings," are also imaginary. You could say it's imaginary people all the way down, but it's more pertinent and less impertinent to show further clear evidence that these imaginary people live in an imaginary time period.
In Letter 211 on p. 404 (14 October 1958) Tolkien wrote to Rhona Beare, mentioning among many other things how far in the past the Fall of Barad-dûr was supposed to be, and expanding on the subject in a note at the bottom of the page:
May I say that all this is ‘mythical’, and not any kind of new religion or vision. As far as I know it is merely an imaginative invention, to express, in the only way I can, some of my (dim) apprehensions of the world. All I can say is that, if it were ‘history’, it would be difficult to fit the lands and events (or ‘cultures’) into such evidence as we possess, archaeological or geological, concerning the nearer or remoter part of what is now called Europe.... I hope the, evidently long but undefined, gap* in time between the Fall of Barad-dûr and our Days is sufficient for ‘literary credibility’, even for readers acquainted with what is known or surmised of ‘pre-history’.
* --I imagine the gap to be about 6000 years: that is we are now at the end of the Fifth Age, if the Ages were of about the same length as S.A. and T.A. But they have, I think, quickened; and I imagine we are actually at the end of the Sixth Age, or in the Seventh.
The bold italics are mine. Earlier in this same letter Tolkien had mentioned his "mythical pre-history," a phrase he uses again in the very next letter (no. 211 p. 398; no. 212 p. 406). Let's look at a few more passages, which I think can speak for themselves. At the bottom of the page, I shall attach a list of all the letters in which Tolkien refers to this world as imaginary, mythical, or mythological.
There is of course a clash between ‘literary’ technique, and the fascination of elaborating in detail an imaginary mythical Age (mythical, not allegorical: my mind does not work allegorically). As a story, I think it is good that there should be a lot of things unexplained (especially if an explanation actually exists); and I have perhaps from this point of view erred in trying to explain too much, and give too much past history. Many readers have, for instance, rather stuck at the Council of Elrond. And even in a mythical Age there must be some enigmas, as there always are. Tom Bombadil is one (intentionally). (Letters no. 144 p. 263)
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The particular ‘myth’ which lies behind this tale, and the mood both of Men and Elves at this time, is the Downfall of Númenor: a special variety of the Atlantis tradition. That seems to me so fundamental to ‘mythical history’ – whether it has any kind of basis in real history... is not relevant – that some version of it would have to come in. (Letters no. 154 p. 293)
I am historically minded. Middle-earth is not an imaginary world. The name is the modern form (appearing in the 13th century and still in use) of midden-erd > middel-erd, an ancient name for the oikoumenē, the abiding place of Men, the objectively real world, in use specifically opposed to imaginary worlds (as Fairyland) or unseen worlds (as Heaven or Hell). The theatre of my tale is this earth, the one in which we now live, but the historical period is imaginary. The essentials of that abiding place are all there (at any rate for inhabitants of N.W. Europe), so naturally it feels familiar, even if a little glorified by the enchantment of distance in time. (Letters no. 183 p. 345)
Mine is not an ‘imaginary’ world, but an imaginary historical moment on ‘Middle-earth’ – which is our habitation. (Letters no. 183 p. 351)
I have, I suppose, constructed an imaginary time, but kept my feet on my own mother-earth for place. (Letters no. 211 p. 404)
In your paragraph there is a missing link, more important (I think) for the purpose than what I said, or should have said, about ‘invention’. Namely: how did linguistic invention lead to imaginary history? So that I think the passage would be more intelligible if it ran more or less so: ‘The imaginary histories grew out of Tolkien’s predilection for inventing languages. He discovered, as others have who carry out such inventions to any degree of completion, that a language requires a suitable habitation, and a history in which it can develop.’ (Letters no. 294 p. 527)
So what Tolkien presents to us is an imaginary time period in our world, a time period in which many aspects of our world were quite different. Without even getting into the metaphysical differences arising from the mythical aspects of this period, like the immortality and reincarnation of the Elves or the marring of Arda before its creation, the physical differences alone, like a flat earth that becomes a globe with a secret straight path only Elves can find that exists tangentially to the now round earth, complicate fitting this mythical time into the past of our world. Yet if Tolkien's imagination was of such power and generosity of soul that he could convincingly inspire a secondary belief his readers cherish, how can ours be so poor that many of us find the suggestion of a non-white Elf, Dwarf, or Hobbit intolerable?
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Letters no. 124, p. 193; no. 131, p. 202 (twice); no. 142, p. 257; no. 144, p. 263 (twice); no. 153, p. 282, 284; no 163, p. 311, 313; no. 183, p. 345 (three times), 351 (twice); no. 190, p. 359, 360 (twice), 361; no. 211, p. 404; no 247, p. 469; no. 294, p. 527 (twice); no. 297, p. 541; no. 316, p. 569.
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*The noun "legendary" refers here "a collection of stories or legends" (OED). Tolkien more commonly uses the Latin form of the word, legendarium: "A body or system of myths, legends, stories, etc., concerning or relating to a particular fictional world; a work containing this" (OED).
