E-g: abcdefg

1. 
   In the course we study the meaning of words relationship between linguistic forms with non-linguistic forms. And its aim is to define why the meaning is so important when using it in a language, sentence.
   
2. 
   Semantics can be synonym with word semantics. Words semantics is also subdivided in reference and concept (sense)
   
3. 
   Linguistic sign is a link between sound patterns, phonemes and concept.
   
4. 
   Lexeme is a basic unit of a word meaning. Lexemes are the head parts in words especially used in dictionaries or word formation. Or we can say also lexemes are the minimal part of a word.
   
5. 
   As we know a word is the association between given set of sounds, letters and a given meaning. Lexicology studies a word, and phonetics studies the function of a phonemes. The importance of them are without the phonetics the lexicology change its meaning into another one. Or without any meaning with only phonemes we can illustrate nothing.
   

E-g: A B C D E F G
H I J K L M N O P … this is the just sounds of the alphabet and we can sing as sond but cant give any menaing. Or anothet example big- bag-beg the second letters in each words are different
Phonemes. Or
I read the book (present): [ri:d]
I read the book (past): [ red ] [short E like a colour red]
I have read the book (past): [ red]