Germanic Parent Language
Germanic Parent Language (GPL) is a term used in historical linguistics to describe the chain of reconstructed languages in the Germanic group referred to as Pre-Germanic Indo-European (PreGmc), Early Proto-Germanic (EPGmc), and Late Proto-Germanic (LPGmc). It is intended to cover the time of the 2nd and 1st millennia BCE. As an identifiable neologism, the term appears to have been first used by Frans Van Coetsem in 1994. It also makes appearances in the works of Elzbieta Adamczyk, Jonathan Slocum, and Winfred P. Lehmann.
Absolute chronology 
Several historical linguists have pointed towards the apparent material and social continuity connecting the cultures of the Nordic Bronze Age (1800–500 BCE) and the Pre-Roman Iron Age (500 BCE–1 CE) as having implications in regard to the stability and later development of the Germanic language group. The emerging consensus among scholars is that the First Germanic Sound Shift—long considered to be the defining mark in the development of Proto-Germanic—happened as late as 500 BCE.
Research conducted over the past few decades displays a notable interest in exploring the linguistic and sociohistorical conditions under which this sound shift occurred, and often formulates theories and makes reconstructive efforts regarding the periods immediately preceding Proto-Germanic as traditionally characterised. The notion of the Germanic Parent Language is thus used to encompass both the Pre-Proto-Germanic stage of development preceding the First Germanic Sound Shift (assumed to be contemporary with the Nordic Bronze Age) and that stage traditionally identified as Proto-Germanic up to the beginning of the Common Era.
Theoretical boundaries 
The upper boundary assigned to the Germanic Parent Language is described as "dialectical Indo-European". In the works of both Van Coetsem and Voyles, attempts are made to reconstruct aspects of this stage of the language using a process the former refers to as inverted reconstruction; i.e. one using the data made available through the attested daughter languages in light of and at times in preference to the results of the comparative reconstruction undertaken to arrive at Proto-Indo-European. The results are not strictly standard in terms of traditional Proto-Indo-European reconstruction, but they are instead presented as characteristic of the incipient predecessor to Early Proto-Germanic, hence the terms Pre-Germanic Indo-European (Voyles) or Pre-Proto-Germanic (Van Coetsem) for this stage.
The lower boundary of the Germanic Parent Language has been tentatively identified as that point in the development of the language which preceded permanent fragmentation and which produced the Germanic daughter languages.
Phonological boundaries 
In his work entitled The Vocalism of the Germanic Parent Language, Frans Van Coetsem lays out a broad set of phonological characteristics which he considers to be representative of the various stages encompassed by the Germanic Parent Language:
- Pre-Proto-Germanic: mora reduction;
- Early Proto-Germanic: (1) ā/ă, ō/ŏ mergers; (2) dissolution of the syllabic liquids and nasals; (3) the initiation of fricativization or the First Consonant Shift (also known as Grimm's Law or Erste Lautverschiebung)
- Late Proto-Germanic: (1) accent modification in two stages: (a) intensification in dominance followed by Verner's law; (b) fixation on the first syllable: umlaut- and accent-conditioned raising and lowering changes; reduction in non-accented position; (3) /s/ → /z/.
Koivulehto (2002) further defines Pre-Germanic as "[the] language stage that followed the depalatalization of IE palatals (e.g. IE ḱ > PreGmc k) but preceded the Gmc sound shift "Lautverschiebung", "Grimm’s Law", (e.g. k > PGmc χ)." Other rules thought to have affected the Pre-Germanic stage include Cowgill’s Law, which describes the process of laryngeal loss known to have occurred in most post-PIE (IE) dialects, and Osthoff's law, which describes rules for the shortening of long vowels, known to have applied in western dialects such as Greek, Latin, and Celtic, but not in Tocharian or Indo-Iranian. Ringe (2006) suggests that it is likely that Osthoff’s Law also applied to Germanic, and that the loss of laryngeals such as h2 must have preceded the application of Grimm’s Law.
See also 
- Lehmann (1977), for example, writes: "Possibly the most important conclusion based on archeological evidence with relevance for linguistic purposes is the assumption of 'one huge cultural area' which was undisturbed for approximately a thousand years, roughly from 1500–500 B.C. Such a conclusion in a stable culture permits inferences concerning linguistic stability, which are important for an interpretation of the Germanic linguistic data." From: Language Contact and Inference in the Germanic Period In: Kolb-Lauffer, et al. (eds). Sprachliche Interferenz 278–91. Quoted from Van Coetsem (1994)
- Davis (2006) p. 40; Van Coetsem (1994) 145–46; Gutenbrunner (1986) pp. 182–97.
- "On setting the upper boundary of a comprehensive description of Proto-Germanic grammar, Lehmann (2005) wrote: (...) a grammar of Proto-Germanic must be a description of the language from approximately 2500 B.C. to the beginning of the common era (...)." Lehman, Winfred (2005–07). A Grammar of Proto-Germanic. Austin: Linguistics Research Center, University of Texas.
- See also Northwest Germanic
- Van Coetsem (1994) pp. 17; 72–73; 146–147.
- Van Coetsem (1994) p. 42. See also Voyles (1992) p. 3.
- Antonsen refers to this stage as "Late Proto-Indo-European". Cf. Antonsen (2002:17-18).
- Van Coetsem (1994) p. 42.
- Van Coetsem (1994) pp. 193–94. See also Proto-Germanic Phonology.
- Koivulehto (2002:585)
- Ringe (2006:68–93)
- Adamczyk, Elzbieta (Jan.1 2001). "Old English reflexes of Sievers' Law". Studia Anglica Posnaniensia: International Review of English Studies (The Free Library). Retrieved 2007-11-14.
- Antonsen, Elmer (2002). Runes and Germanic Linguistics. Berlin: Walter de Gruyter. ISBN 3-11-017462-6.
- van Coetsem, Frans (1994). The Vocalism of the Germanic Parent Language: Systemic Evolution and Sociohistorical Context. Heidelberg: Universitätsverlag C Winter. ISBN 3-8253-0223-7.
- Davis, Graeme (2006). Comparative Syntax of Old English and Old Icelandic: Linguistic, Literary and Historical Implications. Bern: Peter Lang. ISBN 3-03910-270-2.
- Euler, Wolfram (2009). Sprache und Herkunft der Germanen <Language and Origin of the Germanic Peoples: Compendium of the Protogermanic Language prior to First Sound Shift>, 244p., in German with English summary. London/Hamburg: Inspiration Un Ltd. ISBN 978-3-9812110-1-6.
- Gutenbrunner, Siegfried (1986). "Der Begriff Germanisch". Current Issues in Linguistic Theory (Brogyanyi and Krömmelbein (Eds)) 38: 183–198.
- Koivulehto, Jorma (2002). "Contact with non-Germanic languages II: Relations to the East". The Nordic Languages: an International Handbook of the History of the North Germanic Languages (Bandle, Oscar [Ed.]) (Berlin, New York: de Gruyter): 583–593. ISBN 978-3-11-014876-3.
- Ringe, Don (2006). From Proto-Indo-European to Proto-Germanic. New York: Oxford University Press. ISBN 0-19-928413-X.
- Voyles, Joseph B. (1992). Early Germanic Grammar: Pre-, Proto-, and Post-Germanic. San Diego: Academic Press. ISBN 0-12-728270-X.
- Jonathan Slocum and Winfred P. Lehmann, Old English Online
- Winfred P. Lehmann (Jonathan Slocum, ed.), A Grammar of Proto-Germanic
- Charles Prescott, Germanic and the Ruki Dialects