Etymology First attested in the early 15ᵗʰ century, in Middle English; Middle English assimilaten (“to become similar; to make like”), from assimilat(e) (“assimilated”, also used as the past participal of assimilaten) + -en (verb-forming suffix), borrowed from Late Latin assimilātus, variant of Latin assimulātus (“made similar, imitated”), perfect passive participle of assimulō (see -ate (verb-forming suffix)), from ad + simulō (“to imitate, copy”), from similis (“like, similar”), ultimately from Proto-Indo-European *sem- (“together, one”). Doublet of assemble.
To incorporate nutrients into the body, especially after digestion.
Food is assimilated and converted into organic tissue.
Hence also it may be, that the Parts of Animals and Vegetables preserve their several Forms, and assimilate their Nourishment; [...]a. 1728 (date written), Isaac Newton, “[The Third Book of Opticks.] ”, in Opticks: Or, A Treatise of the Reflections, Refractions, Inflections and Colours of Light. […], 4th edition, London: […] William Innys […], published 1730, →OCLC, page 362:
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In the living state, the body is observed to receive aliment; to assimilate a part; to evacuate what is redundant or useless; [...]1822, John Barclay, chapter I, in An Inquiry Into the Opinions, Ancient and Modern, Concerning Life and Organization, Edinburgh; London: Bell & Bradfute; Waugh & Innes; G. & W. B. Whittaker, section I, page 1:
2
To incorporate or absorb (knowledge) into the mind.
The teacher paused in her lecture to allow the students to assimilate what she had said.
His mind had no power to assimilate the lessons.1850, Charles Merivale, History of the Romans Under the Empire:
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A good modern work on this subject is needed, preferably by someone who understands both the Bible and human sexuality, but Sex and the Bible isn't it. I'm not sure what went wrong. Larue has read the literature, but seems not to have assimilated it.1981 December 1, Duncan Mitchel, “The God That Dare Not Speak Its Name”, in Gay Community News, volume 12, number 20, page 8:
3
To absorb (a person or people) into a community or culture.
The aliens in the science-fiction film wanted to assimilate human beings into their own race.
4
Rare, Used with "to" or "with" To liken, compare to something similar.
The use of an animal to kill, wound or threaten is assimilated to the use of a weapon.2005 October 12, J. R. Spencer, transl., Penal Code [of France], Office for Democratic Institutions and Human Rights, retrieved 19 Jan 2020, page 25:
5
To bring to a likeness or to conformity; to cause a resemblance between.
March 13, 1866, John Bright, The reform bill on the motion for leave to bring in the bill to assimilate our law in respect to the law of Scotland
Fast falls a fleecy shower; the downy flakes / Assimilate all objects.1782–1785, William Cowper, “(please specify the page)”, in The Task, a Poem, […], London: […] J[oseph] Johnson; […], →OCLC:
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[I]t [the seed of life] doth, by degrees, aſſimilate the whole inward Man to this living Principle, and conforms the Life unto it.1676, Matthew Hale, “Meditations upon the Lord’s Prayer”, in Contemplations Moral and Divine. The Second Part, London: […] William Shrewsbury […], and Tho[mas] Leigh and D[aniel] Midwinter, […], published 1699, →OCLC, page 478:
Etymology First attested in the early 15ᵗʰ century, in Middle English; from Middle English assimilat(e) (“made like”, used as the participle of assimilaten), see -ate (adjective-forming suffix) and Etymology 1 for more; the noun was derived from the participle through substantivization, see -ate (noun-forming suffix). Participial usage up until Early Modern English.
Etymology First attested in the early 15ᵗʰ century, in Middle English; from Middle English assimilat(e) (“made like”, used as the participle of assimilaten), see -ate (adjective-forming suffix) and Etymology 1 for more; the noun was derived from the participle through substantivization, see -ate (noun-forming suffix). Participial usage up until Early Modern English.
1
Obsolete Something that is or has been assimilated.
At low light intensity, high temperature delays the first flower initiation, as assimilate supply is limiting and high temperature reduces the amount of assimilate available in the plant[.]2005, Ep Heuvelink, Tomatoes, →ISBN, page 65:
the growing root and ectomycorrhizas both act as assimilate sinks2012, A. Läuchli, R.L. Bieleski, Inorganic Plant Nutrition, →ISBN, page 83:
2
Obsolete Something that is like, similar to another.