Definition

1. Adjective:

   • Describing a relationship between two different organisms where one benefits and the other is neither helped nor harmed. The organisms live together, often sharing food or space, without being interdependent.
   • Pertaining to the act of eating at the same table.

2. Noun:

   • An organism participating in a commensal relationship.
   • A person who eats at the same table as another.

Usage

• Adjective:

  • The relationship between barnacles and whales is commensal; the barnacles get a place to live and feed, while the whale is unaffected.
  • They were commensal guests at the lord's table.

• Noun:

  • The remora is a commensal, often attaching itself to sharks for transportation.
  • At the banquet, he was my commensal.

Advanced Usage

• Commensalism: (n) The ecological interaction or the state of being commensal.
  • The study focused on the commensalism between epiphytic orchids and their host trees.

Variants and Related Words

• Commensalism (n): The ecological relationship itself.
• Commensally (adv): In a commensal manner.

Synonyms

• Adjective: Coexisting, symbiotic (in the broad, non-mutualistic sense).
• Noun: Cohabitant, table companion.

Different Meanings

1. Biological/Ecological Meaning: The primary modern usage refers to a non-harmful, one-sided symbiotic relationship in nature.
2. Social/Historical Meaning: Refers to the practice of sharing a meal or table, stemming from its Latin root ( "together" + "table").

Notes

• In biology, it is crucial to distinguish commensal from mutualistic (both benefit) and parasitic (one benefits, the other is harmed) relationships.
• The social meaning is now rare and largely historical or formal.

Adjective

1. living in a state of commensalism

Noun

1. either of two different animal or plant species living in close association but not interdependent