Final answer:
The suffix '-ia' is used to denote a condition, as seen in words like 'dyslexia' which describes the condition of having difficulty with reading or interpreting words.
Step-by-step explanation:
The suffix that denotes the meaning of the condition is -ia. This suffix is used to form nouns that indicate a state or condition. An example of this suffix in use is 'dyslexia,' where 'dys-' is a prefix meaning 'difficult,' and '-lex-' relates to words or language, with the entire term referring to a condition involving trouble with reading or interpreting words and letters. None of the other suffixes listed (-ic, -tens, -de, -logy) primarily denote a condition.
The suffix '-ia' refers to a state or condition. An example is the word 'insomnia,' where the base word 'somn' pertains to sleep, and the suffix '-ia' makes the word mean a condition of not being able to sleep.