Consonant (noun)

1. A speech sound produced by narrowing or blocking the air flow in the vocal tract, typically resulting in a sound that is sustained, voiced, and relatively constant in pitch.
2. A letter of the alphabet representing a consonant sound.

Origin:

The word 'consonant' originated from the latin word 'consonare' which means 'to sound together'.

Examples:

1. The letter 'b' is a consonant in the English language.
2. The letter 's' is a consonant in the English language.
3. The 'f' sound is a voiced labiodental fricative consonant.
4. The consonants in the word 'dog' are 'd', 'o', and 'g'.
5. A child's development of consonants is an important milestone in speech development.