When I look up a word from a search in the dictionary, sometimes there appear the following: (an), (uk), (vs), (ok), (an) before the explanatory English words. What do these mean? Please help. Thank you very much.

Forgot to add a help section on this..
Here's a list, hope it helps.

abbr : abbreviation
adj : adjective (keiyoushi)
adv : adverb (fukushi)
adv-n : adverbial noun
adj-na : adjectival nouns or quasi-adjectives (keiyodoshi)
adj-no : nouns which may take the genitive case particle "no"
adj-pn : pre-noun adjectival (rentaishi)
adj-s : special adjective (e.g. ookii)
adj-t : "taru" adjective
arch : archaism
ateji : ateji reading of the kanji
aux : auxiliary word or phrase
aux-v : auxiliary verb
conj : conjunction
col : colloquialism
exp : Expressions (phrases, clauses, etc.)
ek : exclusively kanji, rarely just in kana
fam : familiar language
fem : female term or language
gikun : gikun (meaning) reading
gram : grammatical term
hon : honorific or respectful (sonkeigo) language
hum : humble (kenjougo) language
id : idiomatic expression
int : interjection (kandoushi)
iK : word containing irregular kanji usage
ik : word containing irregular kana usage
io : irregular okurigana usage
MA : martial arts term
male : male term or language
m-sl : manga slang
n : noun (common) (futsuumeishi)
n-adv : adverbial noun (fukushitekimeishi)
n-t : noun (temporal) (jisoumeishi)
n-suf : noun, used as a suffix
n-pref : noun, used as a prefix
neg : negative (in a negative sentence, or with negative verb)
neg-v : negative verb (when used with)
num : number, numeric
obs : obsolete term
obsc : obscure term
oK : word containing out-dated kanji
ok : out-dated or obsolete kana usage
pol : polite (teineigo) language
pref : prefix
prt : particle
qv : quod vide (see another entry)
sl : slang
suf : suffix
uK : word usually written using kanji alone
uk : word usually written using kana alone
v1 : Ichidan verb
v5 : Godan verb (not completely classified)
v5u : Godan verb with `u' ending
v5u-s : Godan verb with `u' ending - special class
v5k : Godan verb with `ku' ending
v5g : Godan verb with `gu' ending
v5s : Godan verb with `su' ending
v5t : Godan verb with `tsu' ending
v5n : Godan verb with `nu' ending
v5b : Godan verb with `bu' ending
v5m : Godan verb with `mu' ending
v5r : Godan verb with `ru' ending
v5k-s : Godan verb - Iku/Yuku special class
v5z : Godan verb - -zuru special class (alternative form of -jiru verbs)
v5aru : Godan verb - -aru special class
v5uru : Godan verb - Uru old class verb (old form of Eru)
vi : intransitive verb
vs : noun or participle which takes the aux. verb suru
vs-i : suru verb - irregular
vs-s : suru verb - special class
vk : Kuru verb - special class
vt : transitive verb
vulg : vulgar expression or word
X : rude or X-rated term (not displayed in educational software)
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Tremendous! It sure helps. THANKS!!!