-YAA
Navajo
    
    Etymology
    
From Proto-Athabaskan *haɢ (“to do, to make”) in the perfective, from Proto-Athabaskan *ni (“to do, to make”) in the imperfective, future and optative, and from Proto-Athabaskan *enˀ (“to do, to make”) in the iterative (see -ʼĮĮD).
The stem initial undergoes a number of special alternations in presence of ł-classsifier and d-effect (see Stem Set section below).
Root
    
-YAA
| Theme | Category | Bases | Impersonal (+ha) | Transitive (O + ł) | Reversionary (ná + O + ł) | Reflexive (+l) | |
|---|---|---|---|---|---|---|---|
| Ø | S does (thus) 
 | it happens 
 
 | S makes O 
 | S repairs, restores O 
 | S 
 | 
2. various meanings depending on thematic prefix
| Theme | Category | Bases | Transitive (O + ł) | Revers (ná + O + ł) | Passive / Reflexive (+l) | ||
|---|---|---|---|---|---|---|---|
| hashtʼe + d | S gets ready 
 
 | 
 
 | 
 | S prepares itself 
 | |||
| ashja + Ø | S gives a chance 
 | ||||||
| Pi + ʼa + Ø | S duplicates P,  | ||||||
| Pi + Ø | S becomes like each other 
 | ||||||
| hadi + Ø | 
 | S dresses O up 
 | |||||
| kó + O + l | S attracts O towards self 
 | ||||||
| kʼéédi + d | S gets even with 
 | ||||||
| shó + Ø | there is a catastrophe 
 | S does awful things to O 
 | |||||
| tí + Ø | S injures O 
 | S is injured, injures itself 
 | 
Stem set
    
| Aspect | IMP | PERF | FUT | ITER | OPT | 
|---|---|---|---|---|---|
| MOM | -nééh | -dzaa | -nííł | -ʼįįh | -nééh | 
| MOM +ł | -lééh | -laa | -lííł | -ʼįįh | -lééh | 
See also Appendix: Roots and stems derivation.
- In the perfective, Ø-classifier themes always take a d-classifier:
- d + -yaa = -dzaa
 
 
- ł-classifier and stem-initial merge as follows:
- ł + -nééh = -Ø-lééh
- ł + -yaa = -Ø-laa
 
 
- Under d-effect for 1st person duoplural and passives, classifier merges first:
- (d + ł) + -nééh = -l-nééh
- (d + ł) + -yaa = -l-yaa
 
 
- Under d-effect for ná-reversionary, stem initial merges first:
- d + (ł + -nééh) = -d-lééh
- d + (ł + -yaa) = -d-laa
 
 
Synonyms
    
Derived terms
    
Navajo terms belonging to the root -YAA (make)