prefix not, without (anarchy) ({{}}cf. A-(1)).
Etymology: Gk an-
assim. form of AD- before n.

* * *

— see a- II

* * *

a prefix occurring before stems beginning with a vowel or h in loanwords from Greek, where it means "not," "without," "lacking" (anarchy; anecdote); used in the formation of compound words: anelectric. Also, before a consonant, a-.
[ < Gk. See A-6, IN-3, UN-1]
var. of ad- before n: announce.
var. of ana- before a vowel: anion.

* * *

an1 «an; unstressed uhn», adjective or indefinite article.
1. a) any: »

Is there an apple for me? An oak has acorns. Please give me an answer.

b) one like; another (before proper names or nouns used as the type of a class): »

an Elijah in modern dress. She is an angel among women.

2. one: »

My mother needs an ounce of butter.

3. each; every: »

John earns fifty cents an hour.

4. a) the same: »

two desks to an office.

b) a particular: »

It was too awful an accident to describe.

c) one kind of: »

Painting is an art.

d) a certain; some: »

an occasion for concern, an enormous number of pigeons.

5. a single: »

not an ounce of hope.

[Middle English an (unstressed form before vowels) < Old English ān one]
Usage In modern Standard English the form of the indefinite article is a before a word beginning with a consonant sound and an before a word beginning with a vowel sound: a horse, a man, a union, but an answer, an hour. Note that one's choice is determined by the initial sound, not by the spelling. Usage varies before words beginning with h in an unstressed syllable, like historical or hotel, where, because the h is commonly silent or weakly articulated, many use an. In Great Britain an is occasionally used before words like united and euphonious, which begin with the sound of «y». See a2 for another usage note. (Cf.a)
an2, an' «an; unstressed uhn», conjunction.
1. Dialect or Informal. and.
2. Archaic. if.
[reduction of and]
1. not: »

Anastigmatic = not astigmatic.

2. without: »

Anhydrous = without water.

Also, a- (before consonant sounds except h).
[< Greek an- not, without]
prefix. the form of ad- ( before n, as in annex.
prefix. the form of ana- (Cf.ana-) before vowels, as in anode.
suffix used to form adjectives and nouns, especially from proper nouns.
1. of or having to do with _____: »

Mohammedan = of or having to do with Mohammed.

2. of or having to do with _____ or its people: »

Asian = of or having to do with Asia or its people.

3. a native or inhabitant of _____: »

American = a native or inhabitant of America.

4. person who knows much about or is skilled in _____: »

Historian = a person who knows much about history. Magician = a person skilled in magic.

Also, -ian, -ean.
[< Latin -ānus]
in the year (Latin, anno).
An (no period),
actinon (isotope of radon).
AN (no periods), AN., or A.N.,

* * *

prefix variant spelling of a- I before a vowel (as in anemia, anechoic)
from Greek
prefix variant spelling of ad- assimilated before n (as in annihilate, annotate)
prefix variant spelling of ana- shortened before a vowel (as in aneurysm)

* * *

a- ————————
— see a-, 2

* * *

an-, prefix
from various sources.
1. OE. and ME. an-, = an prep. (see prec.) In OE. the orig. an- remained only under the stress, i.e. in ns.; otherwise, it was, like the separate preposition, rounded to on-; thus ˈangin beginning, onˈginnan to begin, onˈbuacutan about. An example of the former remains in anvil. In ME. on- was regularly levelled to ă- (a- prefix 2); before a vowel (rarely bef. cons.) ăn-, as in anelen, aninne, anoven, anunder, anuppe, anhigh, anblow, anlike. Most of these are now obs.; a few remain with an- conformed to the prep. on, as on high; levelled to a- as alike; or assimilated to Fr. en-, as (?) enamel. Only where the individuality of the prefix has been lost, does an- remain, in anon, anent, an(n)eal (OE. on-ǽlan, ME. an-ele(n).
2. ME. an-, reduced f. OE. and- ‘against, towards, in return for’: see and-.
3. ME. an-:—OE. án one, retained in early ME., and subseq. in north. dial., in words now written with on-, one-, or obs.; as ankenned, anfald, anhad, anlepy, anly (= only), anmod, anred, anwill.
4. ME. an-, = Anglo-Norm. an-, OFr. en-:—L. in-, = ‘in, into,’ as anoint (L. inunctum), annoy; anhaunse, anjoin, anvenime, where subsequently spelt en-; andetted, subseq. endetted, indebted; anpayre, subseq. apayre, also enpayre, empayre, impair.
5. ME. an-, for earlier a- = OE. a- (a- prefix 1), or OFr. a-:—L. ab-, ad-, ex-, ob-, which, being phonetically identified with No. 1 above, was like it expanded to an- bef. vowels, and occas. bef. consonants: as in a(n)chesoun = oc-casion, a(n)ferm af-firm, a(n)ired, a(n)oure ad-ore, a(n)orn ad-orn, a(n)tempered at-tempered; a(n)s-aumple ex-ample. Such of these as survived were either refashioned after L., as adorn, or changed an- to en-, in-, as inorn; example, ensample, shows both processes.
6. ME. an-, a later spelling of earlier a-, = OFr. a-:—L. an- assimilated form of ad- ‘to,’ when followed by n-, after L. forms or supposed analogies, as in a(n)nounce. This doubling of the n began in 14th c. Fr. and extended to Eng. in 15th c. In 16th c. it was ignorantly extended even to words containing an- from other sources, from which it has generally been again ejected exc. in anneal, annoy, See ad-.
7. an-, repr. L. an- = ad- before n-, in words derived from L. directly, or indirectly through later Fr., and in words formed on the analogy of them, as an-nex, an-nul, an-nunciation.
8. an-, repr. L. an- before certain consonants, for am-, amb-, ambi-, ‘on both sides, about.’ Through OFr. in an-(h)ele; directly from L. in an-cipitous, an-fractuous.
9. an-, repr. Gr. ἀν- for ἀνά ‘up, upwards, back, etc.’ (see ana-) bef. vowel, as in anagoge, Gr. ἀναγωγή; also in anchor n.2, anchoret.
10. an-, repr. Gr. ἀν- privative, ‘not, without, wanting’ (reduced before consonants to ἀ-: see a- prefix 14), cognate w. Skr. an-, L. in-, Eng. un-, ‘not, non-.’ In words already formed in Greek as an-archy, an-arthrous; whence common in modern scientific words as an-allagmatic, an-alphabetic, an-antherous, an-isomerous.

Useful english dictionary. 2012.

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