long

1 long /ˈlɑːŋ/ adjective
longer /ˈlɑːŋgɚ/ ; longest /ˈlɑːŋgəst/
1 long
/ˈlɑːŋ/
adjective
longer /ˈlɑːŋgɚ/ ; longest /ˈlɑːŋgəst/
Britannica Dictionary definition of LONG
1 
a  : extending a great distance from one end to the other end : not short
b  : extending a specified distance : having a specified length
2 
a  : lasting or continuing for a great amount of time
b  : lasting or continuing for a specified amount of time
— see also daylong, monthlong, weeklong
3 
a  : having many pages, items, etc.
b  : having a specified number of pages, items, etc.
4 
of clothing : covering all or most of the arms or legs
5 
sports : going beyond the area of play
6 
linguistics, of a vowel — used to identify certain vowel sounds in English
— compare 1short 8
7 
of someone's face : showing sadness

a long way

: a great distance
— often used figuratively in various phrases

as long as someone's arm

informal
: very long : having many pages, items, etc.

at long last

— see 5last

how long is a piece of string

— see 1string

long in the tooth

— see tooth

long on

: having or providing a good amount of (something)

long time no see

informal
— used as a greeting for someone you have not seen for a long time

not by a long chalk

— see 1chalk

not long for this world

— see 1world

take the long view

— see 1view

the long arm of the law

— see 1arm
2 long /ˈlɑːŋ/ adverb
longer; longest
2 long
/ˈlɑːŋ/
adverb
longer; longest
Britannica Dictionary definition of LONG
1 
: for or during a long time : for many years, days, hours, etc.
— sometimes used in combination
2 
: for a specified period of time
3 
: at a time far before or after a specified moment or event
4 
: for a great distance

as long as

or so long as
1 
: since
2 
: if
3 
: during the time that : while

be long

— used to ask how much time will be required or to say that something will take only a short amount of time or will happen soon

long ago

: at a time in the distant past

long gone

: having ended, died, disappeared, etc., at a distant time in the past

long since

: at a time in the distant past : long ago

no longer

or not any longer
— used to say that something that was once true or possible is not now true or possible

so long

informal
: 1goodbye
— sometimes used figuratively

take long

: to require a large amount of time
3 long /ˈlɑːŋ/ noun
3 long
/ˈlɑːŋ/
noun
Britannica Dictionary definition of LONG

before long

: in a short amount of time : soon

for long

: for many years, days, hours, etc. : for a long time

the long and (the) short of it

— used when making a statement that is brief and that tells someone only the most important parts of something
4 long /ˈlɑːŋ/ verb
longs; longed; longing
4 long
/ˈlɑːŋ/
verb
longs; longed; longing
Britannica Dictionary definition of LONG
[no object]
: to feel a strong desire or wish for something or to do something
Synonyms see: yearn