Define the following vocabulary words: Sieve, Picture, Comic skit, Trade Union, Costume.

Here are the meanings of the vocabulary words:

1. Sieve: A utensil with a mesh or perforated bottom, used for separating finer particles from coarser ones, or for straining liquids.

   $$\boxed{\text{A utensil for separating particles or straining liquids.}}$$

2. Picture: A painting, drawing, photograph, or other visual representation of a person, object, or scene.

   $$\boxed{\text{A visual representation of something, such as a drawing or photograph.}}$$

3. Comic skit: A short, humorous theatrical sketch or performance.

   $$\boxed{\text{A short, funny play or performance.}}$$

4. Trade Union: An organized association of workers formed to protect and further their rights and interests.

   $$\boxed{\text{An organization of workers protecting their rights and interests.}}$$

5. Costume: A set of clothes worn by an actor or performer, or as part of a disguise.

   $$\boxed{\text{A set of clothes worn for a specific purpose, like a play or party.}}$$