aussi

The French word "aussi" primarily means "also," "too," or "as well." It is used to indicate addition or similarity.

Meanings and usage:

1. Addition (Also / Too):

   • Example: Je veux venir aussi. — I want to come too.
   • Here, "aussi" adds another element or person to what was already mentioned.

2. Comparison (As ... as):

   • Used in comparative structures showing equality.
   • Example: Il est aussi grand que son frère. — He is as tall as his brother.

3. Sometimes "aussi" appears at the beginning of a sentence for emphasis or logical conclusion, similar to “therefore” or “so,” although this usage is less common.

Synonyms and differences:

• Également: Means "equally" or "also," a bit more formal and often interchangeable with "aussi" when meaning "also."
  Je viens également. (I am coming also.)
• De plus: Means "moreover" or "in addition," often used in written or formal French to add information.
  Il a fini son travail. De plus, il a aidé les autres.
• Encore: Means "still," "again," or sometimes "also," but it has a different nuance focusing on repetition or continuation rather than simple addition.
  Je veux encore du café. (I want more coffee / again.)

Summary:

• Use "aussi" mostly for "too" or "also," especially in everyday speech, and for "as... as" in comparisons.
• For formal writing, "également" or "de plus" can substitute "aussi" in the meaning of "also."
• Be mindful that "aussi" does not mean "still" or "yet"; that is "encore."