three    -tatu, esheshatu
(three times) gatatu
En-En dictionary 
esheshatu     3  class 3
singular: i-,in-
  
three (Rw.)
-tatu     adj    three
gatatu three times
gatatu   adj    three times
ishiga (ama-  5  class 5
singular: i-,iri-
plural: ama-
  
(usually used in pl., amashiga) three stones of traditional fireplace
izīko (ama-  5  class 5
singular: i-,iri-
plural: ama-
  
1. traditional fireplace, consisting of three stones (see amashiga), 2. stove, cooker
fireplace    izīko (three stones placed for ~ , see amashiga), ifuro
En-En dictionary 
stone    ibuye
(big) igitāndara, urutāndara
(grinding) urusyo
(rolling) urunāna
(sharpening) irtyāzo
(small, round) akabuyēnge
(three, placed for fireplace) amashiga, izīko
En-En dictionary 
 three found in: Kirundi I (Study lessons)
lesson 27   Class 8 ubu–, ama–
lesson 37   Cardinal Numbers 1-10
lesson 38   Higher Numbers
lesson 40   Review 31 - 39
lesson 44   Some verbs
lesson 47   Word Order
lesson 51   Ordinary Past Tense I
lesson 61   Ordinal Numerals
lesson 73   Father and Mother
lesson 79   Causative Verbs II
lesson 90   Review 82 - 89
lesson 96   Pronoun nde?
lesson 100   Review 91 - 99
lesson 114   Quotations, Direct and Indirect
lesson 124   Narrative Tenses II
lesson 125   Review 111 - 124
 three found in: Kirundi II (Grammar)
chapter 1   Compound Past Tenses
chapter 72   nuko and n’uko
chapter 79   Various Expressions