1. Spreading by diffusion
   - diffusing, diffusive, dispersive

See also: disseminate, distributive

• Letter of Jeremiah
• letter of mark and reprisal
• letter of marque
• letter of the alphabet
• letter opener
• letter paper
• letter security
• letter stock
• letter telegram
• letter writer
• letter-perfect
• lettercard
• lettered
• letterer
• letterhead
• lettering
• letterman
• letterpress
• letters
• letters of administration
• letters of marque
• letters patent
• letters testamentary
• letterset printing
• letting