A correlative combination appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/111), a combination of ᴹQ. qa(qe)- “all” and the similative suffix ᴹQ. -ndon.
Qenya
qa(qe)nde
adverb. in all ways, to every extent
qa(qe)ndon
adverb. *in all fashions
qá(qa)men
adverb. *aiming at all things
A correlative combination appearing in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/112), a combination of ᴹQ. qa(qe)- “all” and ᴹQ. -men “aims”.
ilqa
all the, the whole (situation); everything, all
An adjective or pronoun for “all the, the whole” appearing in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 as a combination of ᴹQ. il(u)- “the whole” and ᴹQ. qa- “each, every, all” (PE23/106). It also functioned as a prefix of similar meaning (PE23/101). As an adjective Tolkien specified ilqa was used with singular nouns and always without the article, as in ᴹQ. ilqa nóre = “all [the] land” (PE23/106). It could be used pronominally to mean “the whole (situation)” (PE23/105).
Conceptual Development: In drafts of DRC, ilqa meant “every, each” before being revised to qa(qe) (PE23/101 note #36). In DRC, primitive ᴹ√kwā- meant “all”, possibly related to ᴹ√KWAT “fill” (PE23/101). However, in The Etymologies of the 1930s ilqa was instead “everything”, because in that document ᴹ√KWA meant “something”, so that il-qa = “✱all things” (Ety/IL; EtyAC/KWA). The word ilqa was translated as “all” (pronoun) in ᴹQ. Fíriel’s Song, also from the 1930s (LR/72).
Neo-Quenya: In Tolkien’s later writings, IL was “all” (VT48/25) and √KWA was translated “whole, complete, all” (VT47/7, 17), but I think ilqua might still be used for “all the, the whole” with a reversal of the meaning of its elements.
qa(qe)-
prefix. all, all the (with plurals), every; each, every
The correlative ᴹQ. qande or qaqende “in all ways, to every extent” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/111), a combination of ᴹQ. qa(qe)- “every” and ᴹQ. -n(de) “extent”.
Neo-Quenya: For purposes of Neo-Quenya I would update this to ᴺQ. ilindë “in all degrees, to every extent” using il- “all”.