The following cmavo are discussed in this section:

mei |
MOI |
cardinal selbri |

moi |
MOI |
ordinal selbri |

si'e |
MOI |
portion selbri |

cu'o |
MOI |
probability selbri |

va'e |
MOI |
scale selbri |

me |
ME |
make sumti into selbri |

me'u |
MEhU |
terminator for ME |

Lojban possesses a special category of selbri which are based on mekso. The simplest kind of such selbri are made by suffixing a member of selma'o MOI to a number. There are five members of MOI, each of which serves to create number-based selbri with specific place structures.

The cmavo
* mei*
creates cardinal selbri. The basic place structure is:

x

_{1}is a mass formed from the set x_{2}of n members, one or more of which is/are x_{3}

A cardinal selbri interrelates a set with a given number of members, the mass formed from that set, and the individuals which make the set up. The mass argument is placed first as a matter of convenience, not logical necessity.

Some examples:

lei | mi | ratcu | cu | cimei |

Those-I-describe-as-the-mass-of | my | rats | are-a-threesome. |

My rats are three. |
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I have three rats. |

Here, the mass of my rats is said to have three components; that is, I have three rats.

Another example, with one element this time:

In
Example 18.82
,
* mi*
refers to a mass,
“the mass consisting of me”. Personal pronouns are vague between masses, sets, and individuals.

However, when the number expressed before
*-mei*
is an objective indefinite number of the kind explained in
Section 18.8
, a slightly different place structure is required:

x

_{1}is a mass formed from a set x_{2}of n members, one or more of which is/are x_{3}, measured relative to the set x_{4}.

An example:

lei | ratcu | poi | zvati | le | panka |

The-mass-of | rats | that | are-in | the | park |

cu | so'umei | fo | lo'i | ratcu |

are-a-fewsome | with-respect-to | the-set-of | rats. |

The rats in the park are a small number of all the rats there are. |

In
Example 18.83
, the x_{2} and x_{3} places are vacant, and the x_{4} place is filled by
*lo'i ratcu*
, which (because no quantifiers are explicitly given) means
“the whole of the set of all those things which are rats”
, or simply
“the set of all rats.”

le'i | ratcu | poi | zvati | le | panka | cu | se | so'imei |

The-set-of | rats | which-are | in | the | park | is-a | manysome. |

There are many rats in the park. |

In
Example 18.84
, the conversion cmavo
* se*
swaps the x

More explanations about the interrelationship of sets, masses, and individuals can be found in Section 6.3.

The cmavo
* moi*
creates ordinal selbri. The place structure is:

x

_{1}is the (n)th member of set x_{2}when ordered by rule x_{3}

Some examples:

mi | raumoi | le | velskina | porsi |

I | am-enough-th-in | the | movie-audience | sequence |

I am enough-th in the movie line. |

Example 18.87 means, in the appropriate context, that my position in line is sufficiently far to the front that I will get a seat for the movie.

The cmavo
* si'e*
creates portion selbri. The place structure is:

x

_{1}is an (n)th portion of mass x_{2}

Some examples:

levi | sanmi | cu | fi'ucisi'e | lei | mi | djedi | cidja |

This-here | meal | is-a-slash-three-portion-of | my | day | food. |

This meal is one-third of my daily food. |

The cmavo
* cu'o*
creates probability selbri. The place structure is:

event x

_{1}has probability (n) of occurring under conditions x_{2}

The number must be between 0 and 1 inclusive. For example:

le | nu | lo | sicni | cu | sedja'o | cu | pimucu'o |

The | event | of-a | coin | being-a-head-displayer | has-probability-.5. |

The cmavo
* va'e*
creates a scale selbri. The place structure is:

x

_{1}is at scale position (n) on the scale x_{2}

If the scale is granular rather than continuous, a form like
*cifi'uxa*
(3/6) may be used; in this case, 3/6 is not the same as 1/2, because the third position on a scale of six positions is not the same as the first position on a scale of two positions. Here is an example:

levi | rozgu | cu | sofi'upanova'e | xunre |

This-here | rose | is-8/10-scale | red. |

This rose is 8 out of 10 on the scale of redness. |
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This rose is very red. |

When the quantifier preceding any MOI cmavo includes the subjective numbers
* rau*
,

lei | ratcu | poi | zvati | le |

The-mass-of | rats | which-are | in | the |

panka | cu | du'emei | fo | mi |

park | are-too-many | by-standard | me. |

There are too many rats in the park for me. |

The extra place (which for
*-mei*
is the x_{4} place labeled by
* fo*) is provided rather than using a BAI tag such as

This place is not normally explicit when using one of the subjective numbers directly as a number. Therefore,
*du'e ratcu*
means
“too many rats”
without specifying any standard.

It is also grammatical to substitute a lerfu string for a number:

More complex mekso cannot be placed directly in front of MOI, due to the resulting grammatical ambiguities. Instead, a somewhat artificial form of expression is required.

The cmavo
* me*
(of selma'o ME) has the function of making a sumti into a selbri. A whole

ta | me | li | ny. | su'i | pa | me'u | moi |

That | is | the-number | n | plus | one | -th-of |

le'i | mi | ratcu |

the-set-of | associated-with-me | rats. |

That is my (n+1)-th rat. |

Here the mekso
*ny. su'i pa*
is made into a sumti (with
* li*) and then changed into a mekso selbri with

It is perfectly possible to use non-numerical sumti after
* me*
and before a member of MOI, producing strange results indeed:

le | nu | mi | nolraitru | cu | me |

The | event-of | me | being-a-nobly-superlative-ruler |

le'e | snime | bolci | be | vi | la | .xel. | cu'o |

has-the-stereotypical | snow | type-of-ball | at | Hell | probability. |

I have a snowball's chance in Hell of being king. |

Note: the elidable terminator
* boi*
is not used between a number and a member of MOI. As a result, the