The simplest definition of an adjective is that it is a word that describes or clarifies a noun. Adjectives describe nouns by giving some information about an object’s size, shape, age, color, origin or material.

You can often tell whether something is an adverb by looking at the ending of the word. A lot of adverbs - not all, but a lot - end in “ly.” For example, happily, quickly, speedily, steadily, foolishly, and angrily are all adverbs. So, if you said:

My wedding day - and I know it's a cliché - was just the happiest day of my life.

These examples are proper nouns because they name a specific person, place, and thing, respectively, giving names to those entities.

"Senior citizen" is a euphemism for "old person". 

Definition of Repetition

Repetition is a literary device that repeats the same words or phrases a few times to make an idea clearer and more memorable. There are several types of repetition commonly used in both prose and poetry. 

Done in accordance with convention or etiquette; suitable for or constituting an official or important occasion.

‘a formal dinner party’ 

Statistics is a branch of applied mathematics concerned with collecting, organizing, and interpreting data. The data are represented by means of graphs.

Statistics is also the mathematical study of the likelihood and probability of events occurring based on known quantitative data or a collection of data.

Statistics, thus attempts to infer the properties of a large collection of data from inspection of a sample of the collection thereby allowing educated guesses to be made with a minimum of expense.

There are basically three kinds of averages commonly used in statistics. They are: mean, median, and mode.

an expression whose meaning is not predictable from the usual meanings of its constituent elements, as kick the bucket or hang one's head, or from the general grammatical rules of a language, as the table round for the round table, and that is not a constituent of a larger expression of like characteristics.

2.

a language, dialect, or style of speaking peculiar to a people.

3.

a construction or expression of one language whose parts correspond to elements in another language but whose total structure or meaning is not matched in the same way in the second language.

What is a verb?

A verb is one of the main parts of a sentence or question in English.
In fact, you can’t have a sentence or a question without a verb! That’s how important these “action” parts of speech are.

The verb signals an action, an occurrence, or a state of being. Whether mental, physical, or mechanical, verbs always express activity.