part of whole
a part or share of a whole
Water covers a large proportion of the earth's surface.
Loam is a soil with roughly equal proportions of clay, sand and silt.
The proportion of regular smokers increases with age.
A higher proportion of Americans go on to higher education than is the case in Britain.
the relationship of one thing to another in size, amount, etc.
The proportion of men to women in the college has changed dramatically over the years.
The basic ingredients are limestone and clay in the proportion 2:1.
The room is very long in proportion to (= relative to) its width.
the correct relationship in size, degree, importance, etc. between one thing and another or between the parts of a whole
You haven't drawn the figures in the foreground in proportion .
The head is out of proportion with the body.
an impressive building with fine proportions
Always try to keep a sense of proportion (= of the relative importance of different things) .
the measurements of sth; its size and shape
This method divides the task into more manageable proportions.
a food shortage that could soon reach crisis proportions
a room of fairly generous proportions
the equal relationship between two pairs of numbers, as in the statement ‘4 is to 8 as 6 is to 12’
to react to sth in a sensible way and not think it is worse or more serious than it really is
larger, more serious, etc. in relation to sth than is necessary or appropriate
They earn salaries out of all proportion to their ability.
The media have blown the incident up out of all proportion.
If proportion is used with an uncountable or a singular noun, the verb is generally singular.
A proportion of the land is used for agriculture.
the proportion of与复数可数名词或单数集合名词连用时，动词通常为单数；但如果是a（large、small等）proportion of，则常用复数动词，尤其在英国英语中：
If the proportion of is used with a plural countable noun, or a singular noun that represents a group of people, the verb is usually singular, but with a (large, small, etc.) proportion of a plural verb is often used, especially in BrE .
The proportion of small cars on America’s roads is increasing.
A high proportion of five-year-olds have teeth in poor condition.